Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2aba26ab96b8e5…

MALICIOUS

PDF

77.9 KB Created: 2021-10-06 01:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9bd50bd5a15f2bf376f4949f5d98e89d SHA-1: cf52fc85fffe39b67d7440bb5534d1ffe92083c9 SHA-256: da2aba26ab96b8e5ea960039db56a15286d3288523b40934305d1599f7bb0de7
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. Heuristics suggest lures for payment redirection and callback phishing, pointing towards financial fraud or business email compromise. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=tx+comptrollers+office PDF link annotation
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed1aaf15f7---78006240526.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/51122074789.pdfIn PDF document text
    • https://protum.se/file/nugazipan.pdfIn PDF document text
    • https://masihpt2.com/contents/files/pademupapaxenuriwu.pdfIn PDF document text
    • http://kechengchem.com/upload/files/49895458480.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/56570146541.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/67391491394.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/refaw.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a6de1ef0---92621050107.pdfIn PDF document text
    • https://emenu.hu/editor_up/30951165636.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/95058541994.pdfIn PDF document text
    • https://indian-sped.szabgab.hu/fck_uploads/pdf/56576457811.pdfIn PDF document text
    • http://3sdent.com/upload/files/lojetufoduwide.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/dadaragifaguxigutapabo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/qvev80gn5p3fktqirr0b16qjat/zarewisaj.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/filexojivit.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16152119d013eb---60620263006.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/2a143bbc77aa1c7f66dae1dc434c6d7b/xixagefaxu.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/tumikex.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c7718179f---35405361259.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/zuwejanuduxekikinagovi.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/5805535575.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/32361711375.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/46079078698.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_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AD 18340 bytes
SHA-256: c790194a7e573fcf5433b09d2dba2546eb5c3dac04430f60d83b14a4c978cd55
font_02_sfnt_off00011278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11278 10440 bytes
SHA-256: b074449f30f4424a13880d8cbf5ad3452859941ec2503da7b40c7b7c146ebe1b

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