Malicious PDF — malware analysis report

Static analysis result for SHA-256 07af789bdf9158db…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 20:27:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 616173070bfe409d9562cd6a1b585b52 SHA-1: c0389ffdaae62e1fda33259422161b221a63a77a SHA-256: 07af789bdf9158db5ef0581cf30a9c181bb1ee15a26e720f5d8f7e852dcc4869
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/623e098b217fca715a18d63e8e6f6d55/dinigasofatizulurum.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836f4b9b5a9---29557098546.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/wanofetumerarixafam.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/30541957619.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093acdaae97c---69964095202.pdfIn PDF document text
    • https://rcot.org/userfiles/file/41036759845.pdfIn PDF document text
    • https://2acontractor.it/images/file/vigifi.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2rls3bt2dkkidgigmkq6oeup97/38320772757.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5g482b72t1p8tdeas4serbbrj3/26091533013.pdfIn PDF document text
    • http://momsystem.ru/public/file/gilutetamezarojulorag.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/punisimoputus.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/ec3d221125adc41d5cbc107c08776c4b/77371775762.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/10244233864.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/74502878705.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/lapumigisurowubokop.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/50574842561.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072321b1d6fa---14290657698.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/9ab2ba35c0fa0a170b927784ae34a663/3963094775.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/26399054537.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/xukowiwumedupamal.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/foif3c93s0u57kg6obaakmsgp1/gadadubazesegikixe.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986bb4631f7---92010382208.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/luduvejawafefupilo.pdfIn PDF document text
    • http://freewest.at/62964003722.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3c821212a77a525e0446db83b9ef2fa3/bidisofivekokipubufutex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=linguaphone+english+books+pdfPDF 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_off0000e02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02A 19812 bytes
SHA-256: eefec8b434fb12d255a72539e0dd87a1426cc4f63bdf1bfc9d9728d7bbc6936a
font_01_sfnt_off000113f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F0 10868 bytes
SHA-256: 3e1cda9a18161a898390f3eff5b4623aab315cdb595d31aebb3dcb80bd6284cd
font_02_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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