Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae7b55a42eff280d…

MALICIOUS

PDF

92.5 KB Created: 2021-07-04 01:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f80d7bbf846803f1802d059bb520660d SHA-1: a5d084146b378a40df37d40639addff47d1b96fd SHA-256: ae7b55a42eff280d8d923cc00a924cebd1867378baaecb705865731128bc1fa7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://crewmak.ru/uplcv?utm_term=jewel+of+the+seas+itinerary
    • http://syuncyoku.jp/upload/file/76089455010.pdf
    • http://cheapmarkt.com/userfiles/file/walonejazise.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1640d8a2d---koduzolipudekikuvuben.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2271b53337---37791414626.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8b4abaed0b20de48fe61a434e4c2b63/piresurolevebaxi.pdf
    • https://branchennachweis.eu/userfiles/file/74684628343.pdf
    • https://torgradio.ru/new/files/file/mutizonidawav.pdf
    • https://bouveau-consulting.com/userfiles/file/wixag.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074a64639e76---xibowinulinusepowa.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/a3bn0t1519fngdcm30tb4ige4e/85373790276.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bc70ab5a58d---26722570186.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/vi091etmio9417cvb65u3ebkuh/85918254852.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/omqu8be8aof0hvcsst9hihenkp/vegebamekilu.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a119c44bf23f86bd297745bc26d8340c/rasavurisabagofejuvuti.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e0fa463abc142a83fe1836d9376fdbbd/95519970230.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ceac6a75a21---xegeluvezin.pdf
    • http://caffepontoni.com/uploads/file/44579245160.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c252de9c6ff---jitemu.pdf
    • http://wasserburg.pl/userfiles/file/46009729841.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607777c2ccbac---12175271531.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/ccdf67cad4849c76ecdfae33b6b937a5/muwen.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160726e8643d3d---46948029566.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f999.bin
b17422d549dbc0c6faf6a4cc1dfa82e50f5323fde58d3411accebcac6c71d23b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 22536 bytes
font_01_sfnt_off00013514.bin
a92226834499a8e4b2ba477ecd302daa5e9c3d483552bbe07fb8d7d0e1b039a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 10504 bytes
font_02_sfnt_off00014d0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0A 16792 bytes