Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b5dfcd86e15866…

MALICIOUS

PDF

75.2 KB Created: 2021-09-06 17:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 16307c9077bd93a6834974e2ce3af934 SHA-1: 9b2786424d2dafc01824c1862c6f552d53e4b73f SHA-256: a4b5dfcd86e158662811fe32852f76c1353b543f3c7ace7c5161219c66edeaaf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of multiple links to potentially compromised WordPress sites and other disposable hosting suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the overall structure and heuristic firings strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://podereilmontaleo.it/writable/public/userfiles/file/35283971773.pdf In PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/erfaop9ni1edc6b1vkvsj55p06/bunebusavon.pdfIn PDF document text
    • https://naoshima-habitant.com/feduk.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/a2166504ad3e7d596fadc59489ebfc43/43409042508.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/5567264198.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/920f728c2214d692008eaaa24b10d029/gopuzazaxakarurinu.pdfIn PDF document text
    • http://prograsifkalip.com/files/81872407703.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/15612248524.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/94821171706.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/36913423151.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1b9b56e1dfda737bfc810dfeb4b58797/jodisupa.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/wubolobanaridejorere.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d642169dcb---rexumew.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/xepidamogunup.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b4426f5c3---72638425202.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/gixoxotuwosimanef.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/jezedunin.pdfIn PDF document text
    • http://myphamasia.net/upload/files/92173257165.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/mivikox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=properties+of+parallelograms+practice+worksheet+answersPDF 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_off0000beee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 11108 bytes
SHA-256: c11a74d98f42440d7eaf4e08d57520ad41a9f12778fda0a534995d31f973742d
font_02_sfnt_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 17708 bytes
SHA-256: 7fd4b4c7ba8999d3142efc2b84b0b41ac368dd1f0fd28a16bd5de8ff3f4056d3

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