Malicious PDF — malware analysis report

Static analysis result for SHA-256 69728d2a755f9af3…

MALICIOUS

PDF

89.5 KB Created: 2021-07-15 12:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ed970e5f52498d8f0ac6cb95a7f1d16 SHA-1: 0f3e4d90267900a1296dec51d9960f1ff38ede5e SHA-256: 69728d2a755f9af36a6a4a5b2ca6b8412e23c80bea26195d103404636f34c803
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and numerous external links suggest it's designed to redirect users to malicious content rather than provide legitimate information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c69fb004920---nagajezijefurume.pdf In PDF document text
    • http://jfkanacon.org/data/userfiles/files/93008107283.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/sefap.pdfIn PDF document text
    • http://cortabellanews.com/userimages/60247719000.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/tekefukenezasuz.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430105156594342.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/65094527030.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/71eb994e4736a31684f99095d8508d44/74920138367.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b841c2f53f---pinanakitepevo.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/79456977.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96f6daeb6---nujajuxofabusosusamelul.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6ec79706649df2adb5813e33c232d1e9/40651659216.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/32ck1p8jgm2vueu5it1p1olrha/modibizazalok.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/nipipadujoneter.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/7675340d96be3b00eac86985660e066f/51215514128.pdfIn PDF document text
    • https://asiahijau.com/contents//files/fuxixeridadum.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e717a0d7a---19648763184.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/31461816365.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d800309bc---rotupolitagubotek.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/latalokefi.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105100118.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93383e6ff---20921783821.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cer4vfl9uohgsef364b66sgv3/91703090262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=level+0+dfd+for+online+shopping+systemPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/zesup.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 17428 bytes
SHA-256: d7699ad31dda8dfc63b90549452a69bc971ca37bbd7d294377146a60afcbe33c
font_01_sfnt_off000127f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001400b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1400B 11044 bytes
SHA-256: 5b83a3e0d6690a07c90bf6d7d25dab9b0d77945f34a32198dd6122eb8726ce5b

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