Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62f85b111a4c2ed…

MALICIOUS

PDF

125.1 KB Created: 2021-07-05 23:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 566c5915ebbe2299822dad425f0100c9 SHA-1: 5f5f2972277816e88581493c7ccebf54f112baf3 SHA-256: b62f85b111a4c2edcba8258cafa2bc21373e5af15f6325c1c5720fded6512716
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and was identified as malicious by a machine learning classifier and ClamAV. The embedded URLs point to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO spam. No scripts were extracted, and the document body was unreadable binary data, indicating the malicious functionality is likely embedded within the PDF structure itself.

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 http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/12319174939.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/62ae1c02d65b2cff2814bbfdf457367b/nusagorakonagemejaku.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/sawased.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51ba395bd---sorutoranoteponisapizanet.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160913a4addfec---garefidimivodekuxonofeni.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd4fad568---65881104214.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aef9f5cf97---doderewafufevojupas.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d245c94bdd28974c4f13fc4933153378/76380063705.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/mefudo.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1a1c4d3d08582c22b6656c9e03d18f24/91240156513.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/jelurinazajinirilegu.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/wafuvubigela.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/59630954986.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/xelonilidedemepolex.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/76397056157.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/vepumuxirowun.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/texibog.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/92133666609.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/066de0859d828a4bc369be30137bd7a6/fitad.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608464ea17235---mulisefabefixujeriwujorur.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/rf5re97u4d0o9ja52u2js9a172/98480860850.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/8c2eeb329a166cc32ddd87024b1e0891/71873691507.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/2460916641.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b285a0e5a---vuvipulagipojavefuvepuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=raw+to+kibblePDF 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_off000186cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186CB 10092 bytes
SHA-256: a4e7204ec916ef4a90c77833a4bb097e02cc2c6d386a8fff89462ef3b3ebf350
font_01_sfnt_off00019d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D80 19252 bytes
SHA-256: 80e0048299f8eb740b21d294a5d70cfb6153ecfef7777c6dcb17b24c39ebce50
font_02_sfnt_off0001cf13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1