Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9d87e934fc1019…

MALICIOUS

PDF

94.6 KB Created: 2021-06-29 06:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 716d43c48a8e79fae45203013401b081 SHA-1: 04327adff1af47320ad4709ca217f9e98e818801 SHA-256: ef9d87e934fc1019899c1bab9bf7831ea78a1d5862f1b61c1f58770de056edd4
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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.
  • 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://gmnavarra.es/ckeditor/files/53835629114.pdf In PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/c5faca81cc0e0d3a56180dcb308b2de8/mojoxitozobugaveva.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796556edf57---rirezipejavifeguwibifiv.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/buredijirukokigitazug.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb05ceebb3---wikez.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877ba030caa---tegeranaxunog.pdfIn PDF document text
    • https://bselink.com/userfiles/file/90806956781.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b08fde2556d---54951505633.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079145828e81---79124372479.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/27139039948.pdfIn PDF document text
    • https://zold-kommando.hu/files/zuxivi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/aad819e04afde8a451647ded4b8b03ac/zigifiluwavijomozaged.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/qdgb76cn4q39n5n1qi8q13a0ku/lulolapagamiwofewine.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/e39861b71745763166592453b8f6ef06/mamobezogijezeluzuteroni.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f446190d---22782314035.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609abf98a3849---kabuxawagujixubavejik.pdfIn PDF document text
    • https://btegypt.comfile/76109882481.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a133cc3c1f7---muxutiferasipizes.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1f9cc314c814dbb98d2ac0286e23d33a/jivogiki.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04a780e77---78593473270.pdfIn PDF document text
    • http://belloverde.net/emailer/file/33848795502.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/56755567062.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a025eb5a129---97612295144.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609435fabfba0---serirapazerotudukim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=consideration+in+tagalogPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000120b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x120B9 18128 bytes
SHA-256: 6712c39f1a871e2d9d92a9beb5f4a1839bfc450ae275f67d8d56bea156528158
font_00_sfnt_off0000f272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF272 18232 bytes
SHA-256: 7297a00b5c6351b15888a78087c69a83253cfc2039f362634a5ee331a5aade82
font_02_sfnt_off00013d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001554a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554A 10456 bytes
SHA-256: cdef0a4c8ee7ef9c82af8ce02eaf8fde37d8f975ea94fd85b77873979a52bc2a

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