Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b8c5969979748c…

MALICIOUS

PDF

308.6 KB Created: 2021-07-07 02:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b83558ba93a99bc5b320ae254c41c66b SHA-1: a88e233f2b523501cdf48709c36f907d9bd5c91c SHA-256: c0b8c5969979748c6fa57dc5f756b5311fdccc3c8c789b284a134e0bd9335a42
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised CMS upload storage, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically identifies a lure linking to an SEO redirector, suggesting a free-download phishing tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=was+were+did+exercises PDF link annotation
    • https://tecnibat.net/uploads/archivos/70045472728.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/luzozewuxiredavubus.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/0cb7b2bb156f9cad9e5a41e3a0aef54e/30743981359.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607355c3b94e0---bafujal.pdfIn PDF document text
    • https://samudra99.com/contents//files/42345032257.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/71011669768.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/04536ac06b0a7e3827ab03a146f7e6f5.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b40766b95---mujixur.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/wipegotededan.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4a5294f9---fenudibokubujebix.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c841112080---fijapokapuzuralerujofunak.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ou8147hpl3m7ie1te2pge6sse7/96396119283.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/kutuwafusadideme.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/kelefekimipulaxoluvaz.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098743ab7adb---piteveravarewevifeveku.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/masekixesinir.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f488f212a---kinofomenapuvotenifetil.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/91189754693.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/7od8p8qfer05uemhjs1se2n5l5/13341564280.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/dofajoril.pdfIn PDF document text
    • https://tepihtrava.rs//files/jalifotopunubek.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/tknh217rvodb6cnhiojqcqlusf/73332967165.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/43990328265.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4dajdsc6l192tul029m8dbeelb/20593655631.pdfIn PDF document text
    • 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_004_off000434b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x434B6 19968 bytes
SHA-256: cbd65a56006adfa7c8c85839ce00e69489ee3fdb20c90e87f977b059b103db0c
font_01_sfnt_off000456b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x456B4 10176 bytes
SHA-256: 1383ec7538d6f77866540124d35c16f2ad1f73e8084e3ee234848f746eb6eb93
font_02_sfnt_off00046da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46DA3 25904 bytes
SHA-256: c4f0a42bf5586841f032e83172e9e6b21ae4277ce42a474e536e6535639045bb
font_03_sfnt_off0004abc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ABC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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