Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3c54156cd1f678…

MALICIOUS

PDF

85.4 KB Created: 2021-07-13 07:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b96a96c3c3f380eb3ce39b1c4d789011 SHA-1: c78e48ba611492e8b2e1bcc50cc25a3c946f1a9d SHA-256: 3f3c54156cd1f67838f5ac0f4fd467434ca10079871192c13f29f73353a3edc8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, many of which host other PDFs. This structure suggests the document is a link farm designed to lead users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ulq12gehcsr1b2ou698e7pkbc4/50773656885.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/rlnuodjkihj5o9io7t5b3d88jb/44482024620.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16093c047885f5---pepifatebulodopelev.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075af9795eb7---jobodabajurunitojeti.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g02jik7b7sv0nc72ctrsh0qb1f/91863223453.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f98c7c6740---29780236968.pdf
    • http://asckhn.com/acskhn/userfiles/file/61224316126.pdf
    • http://samrayburnclassof1980reunion.com/clients/873185/File/vawitexosefam.pdf
    • http://www.companyforte.com/imagenes/editor/file/megukipobusuwetebuwozol.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6cgjvsudhjol73stlog65b8mul/36756845083.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e9ekj3tk4jpsh70uebi5a51ud5/35846149270.pdf
    • http://tahi.hu/ckfinder/userfiles/files/96435538942.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a5eca7e47---69695871878.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609601a5785bf---kisokemigiw.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/35skebg3ltlq3fhvc13lao9r4b/13558212972.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/fe47be834f43ad7402f0eca7f2f8e132/16521650584.pdf
    • https://cabsfromheathrow.com/userfiles/file/7967276898.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4aa0549e6---muxoxefebatinijigofafaj.pdf
    • https://mojer.bg/files/12719427970.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e1342e58f---52594951416.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc4fff1e22d---82458150337.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607106517966e---fowuzixidopolebawivewadi.pdf
    • http://brandnewgoods.net/userfiles/file/zenixetivakezarinojag.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160739434d193e---ruwirerexaf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ginger+beer+airlock
    • 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_off0000ed88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 16792 bytes
font_01_sfnt_off0001059a.bin
4fff30f87e50aca816a4ec12872c2718eb41ff4bafff2003f39f31ad13afc893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 16668 bytes
font_02_sfnt_off000130de.bin
0d409120e0687bf88ff40c677e538875303c593967891d973e3c8e0bd6134298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130DE 10412 bytes

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