Malicious PDF — malware analysis report

Static analysis result for SHA-256 78018d1c388eacf6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-02 14:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 04c4420bc00eb9e329c4f0098113dd94 SHA-1: 17eb9f941a6a0d8a52836d388d053ca99c7eeb7e SHA-256: 78018d1c388eacf62da0bc73821c4045bff82f025c6654e364330dcc4f970a68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a large number of links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b27138e292852b59b86f2cf17303932d/jovipunuwepijubexezex.pdf In PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/vulizikukim.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ae777bc4f05f19df1b97e34f522a21eb/26241544035.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aa5fee201---kiwizuriken.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/4132924191.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/xebaxi.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/50217838540.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/j3g4qnqvb7cm7l06ms8bula3nr/78203396058.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/sulekadotiwumujofip.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8636b23bb6ab54bbe26fdef2a7e0caac/lipepagisuzaxokuwelod.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/38919635086.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/jolowokujobamafik.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cac51e37d---3089999166.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/45872990211.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c4a23a47c---9917354473.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/60869111504.pdfIn PDF document text
    • https://norservis.com/files/files/pumetujemewidalelusujuxi.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/90908515891.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/7f2225100a30abde44d03bcc040e1752/36428800136.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/50925555803.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160de240dab435---65530092578.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e84dd640---68203327828.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/jofemagirekipamixapotaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=shapes+worksheets+printable+freePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B0 16160 bytes
SHA-256: 190a11a04714377487b3a4a4b7ae65851e8d3c3ebb37f9b77ac1d375c5a37b64
font_02_sfnt_off0000fb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB45 10848 bytes
SHA-256: 30b99ab7d96d7dd3d58e558bf4f4f6e951e391feb538e5063ef94794509d283e