Malicious PDF — malware analysis report

Static analysis result for SHA-256 c156987c714dda7b…

MALICIOUS

PDF

94.6 KB Created: 2021-07-26 12:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: eabef02850b1f08b9e3cf19fcfe32d2e SHA-1: a17124265d29d869e39e06be8cc5f338997284eb SHA-256: c156987c714dda7b18e62f2e18185e8928204ee0b321938d345a874ffb91b148
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a deceptive lure for payment or an invoice. Although no scripts were explicitly extracted, the presence of multiple PDF link farm heuristics and the ML classifier's high confidence score point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://anhuizhkj.com/upload_fck/file/2021-5-5/20210505153445239408.pdf In PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d1b4e813---nigin.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3e941cb3---37524961034.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201838300814.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b750461ba---89127967877.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160844ab787dba---dekeke.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/5c59b54ad3160e8bbf3d64591a7fe524/zabedijefuziwud.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/dlv5n3ktetg7tso5ir3b0rjnd3/78974171748.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/aa771c2a95f333a014eadeac6a344591/rutepiritiwokuxizu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/23bc253a4b0dcd0961f259fff834a184/31799619485.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072389ec82c4---93926736124.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9cc272cdd---jegisamukoburotipuwelixu.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/4828840284.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5578b26453---37634554626.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/60d2fc0854b2300c7132e93428a76f38/meratusapeluzis.pdfIn PDF document text
    • https://luminex.pl/upload/file/76558643569.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/38880713286.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/20300572119.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/501e6b7adb9715092d9a3313abe2069f/fusujobaf.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/989bb11356a372513e013e92810a5a8b/69090888370.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/tudal.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/dcddcf087d544979b59074585fa53507/2865056253.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/1k1ehkm2dveql3fcbd52mtl52v/21448470608.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/jetinixojij.pdfIn PDF document text
    • https://questyme.com/userfiles/file/bejedod.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/369eded05de350be8e6951109b49e2d4/begotira.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/71190731663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=problemas+de+multiplicacion+con+decimales+para+5to+gradoPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C7 18984 bytes
SHA-256: 298be5c1be6a8d108ec766a5c931d5bd5105ea2350a8bebf7ef6bf71f37e3491
font_01_sfnt_off0001378c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA3 11232 bytes
SHA-256: ca262e7a8a6d506c384c997fd3ad1b7a6452d7e823fdf27e37f2fba4deb5d1dd

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