Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1fac2dc1a390c7…

MALICIOUS

PDF

100.8 KB Created: 2021-06-30 02:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e636182b5315c7d83f071136db78ab44 SHA-1: aa8d1ab1b26a680ed6000bef695ef99cab5e9fae SHA-256: 0f1fac2dc1a390c78b4c215b273e9f14b0cb120ab35cdc37a5cedb127d47d2b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/ba7ad4da3602437be06b096313836076/jemop.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/43822488072.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac379c05fd9---42238992520.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c265171022---difemanepud.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/04rmo3f5dm1re74rg4i7qep1he/19661880440.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/25107109a8c5ec8e3490004ea21fd5f3/jetovudezimuporagilamebo.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/88200335659.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/vuzezizekoku.pdfIn PDF document text
    • http://benly-carson.com/product/files/1121210065.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/25537533990.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b4bc04b8ac7a852e263ab932d137a7a9/gunaxasawuku.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e87baae7a---18591475424.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845ced859ee---sixur.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/218036c596b8dc564eb77839ac0fe9d0/11797217107.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/e18dc03e773bc7cdac4825bd20c92183/sifevobanenorodi.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/64dfc295f7537b6a5eb6b24c9a1e5224/97639041245.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/15495208741.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/2979232915.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089d5d4540a7---40512968991.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/11331161684.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/44313820310.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a742074119e---31428676920.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/nlhbb5618ltnudf2t424ff1mb6/77548533419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=pounced+meaning+in+kannadaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000165f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x165F4 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 23700 bytes
SHA-256: 9095b8128d63aecd253ae3484feb3f144689aa74e736f625415c8c99b5a6bb15
font_01_sfnt_off000128c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140DF 10496 bytes
SHA-256: 5df6e97a8572797502e1a4243b7fcbd27cc734baf19231c27679126beebfdb9f
font_03_sfnt_off0001587a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1587A 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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