Malicious PDF — malware analysis report

Static analysis result for SHA-256 876e8d403da6ee89…

MALICIOUS

PDF

73.8 KB Created: 2021-07-02 04:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 01c4b1ff5b3eacb91240d190a769d4af SHA-1: d6bf577e44949885b55462b968bc8d07c144b6f8 SHA-256: 876e8d403da6ee8948aa14b1efc2ee75d748b59f76dadff5ec652487a9b9eac2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, many hosted on compromised CMS platforms or disposable domains. This behavior is characteristic of a link farm designed to lead users to malicious content, likely phishing pages or malware downloads. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://jdrum-music.com/uploads/ckfiles/files/53722306991.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/5067f0440c2a321b7bac4f543104559e/vifafosawolekifidivinofew.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/40122431278.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/g4ncnucllpv84u3ehcau5if2k7/44721611519.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/tolakawesurorup.pdfIn PDF document text
    • https://telenovella-bg.com/files/56342348483.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607140fe3074f---63053469014.pdfPDF link annotation
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0d7bceed8---80319944617.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/e5011f543bd239d9d535f47f64e87bed/jolalikuzezil.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d17cc4c753---28731146396.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/221bfbe04312915685e84258146929af/furunotudikuraxumebekero.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/437df8048b369f9c12040c0618854cb5/gawamorux.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bef8278d7b---568369503.pdfIn PDF document text
    • https://beaszemin.com/files/17389498480.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607831853612b---tamamiguvekivig.pdfIn PDF document text
    • http://inphilong.com/upload/files/29628862778.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/kifidubatagebelega.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/nexofixaletuviwilovut.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/32680730096.pdfIn PDF document text
    • http://allycatering.com/userfiles/16431661137.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/91494582741.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d83ec659436---8194212634.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084e10375f2a---xuxitonok.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/eeb676765c665004e0e24624c42c5a1e/sujiwop.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/86975056758.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/wusesetigitevexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chapter+14+2+human+chromosomes+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_off0000bdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 10968 bytes
SHA-256: 5323a5fdbb00472482925abbb36c7fa8f6a249232be681c5b4d69bf858015d4e
font_02_sfnt_off0000ef5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5B 16464 bytes
SHA-256: fdad7b9c4efd2d0c6cd039e2e89c706ddc6c7b4c40830b02697f8e3082967fdb

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