Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3a97aaf097dd24e…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 18:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2248b6b06f51a317bc70c3ff12a0376b SHA-1: cfcc9699e1023bb85db7f33797159cb86565fb41 SHA-256: d3a97aaf097dd24e57806c95e1c2163971f00ad7a4d3eee9c8e36cfce95a2faa
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to compromised websites, consistent with phishing or malware distribution. The presence of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics, along with numerous extracted URLs pointing to potentially malicious domains, strongly suggests this is the intended attack vector. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://allytemp.ru/uplcv?utm_term=what+solution+focused+therapy PDF link annotation
    • https://saunadlaciebie.pl/userfiles/file/sijokunepovebinajevogig.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/86527912510.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf2450e021---lovigegewimufivatezus.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/960be4ebfb7e8d8132c8428810ed9f48/sexafa.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/67323184504.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/modem.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd809695b5---dumedovo.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3008fa85f24cab179611e3ef408ca222/71156626031.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/binobizamerutafomix.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/goriximisedigenaliko.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/32287205221.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/52901522201.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/23805035831.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//sametomoluwe.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/valatubogox.pdfIn PDF document text
    • http://mosjob.ru/images/file/43291535564.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wesode.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/semiruwodi.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/kiweririsodixazeju.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/2548d33450bdf5580774d99a156bb452/10636583138.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160897536479e2---15085806090.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160820d4280d75---61353426235.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/1838714027.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/umtnjn5933njij1b7u2pmdbnr3/82952691978.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_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 10924 bytes
SHA-256: e62d5dd4cf93c9bfc04b2dde07945281549e1d755066d9ec373b0baa93aa6793
font_02_sfnt_off00012440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 17180 bytes
SHA-256: 28e1255d66d365eb715a0c64c76bcb88aa7d5c716431e7fe8c525ac1a094930f