Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f35e672acc0f0ba…

MALICIOUS

PDF

70.4 KB Created: 2021-09-04 22:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2a7e8dfd8cdd782decc3e499615a657 SHA-1: 44b1aeb44820dad3be890c2ac7192bf6f75dd10e SHA-256: 7f35e672acc0f0ba304a3b100ee3fee3c4ef7f613f96384ef6046169aa93c6c6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the links and the PDF structure suggest it's designed to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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://stopserv.ru/files/file/87515176866.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc51b5bc9---valisena.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021081015065073499.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/57358250459.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127620defffd---xagajomutagivofumaba.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/25547966815.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/96690541434.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d317b5ee---27649537866.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/komovutalixuxirikekaf.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b85526660---55062660633.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/jatomi.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/jitoxubamajavugojud.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/b32n80th69ho72vtcpf4i11lns/6418421659.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/46607631636.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099996e00f72---wizikesixutoxubarelitumu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd97fddd50---37983041167.pdfPDF link annotation
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/b37f47d32c6daa928777f80523ed2a43/wawona.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/tuviridexogu.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/91749659855.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ccba5b021---34699650222.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/85706881020.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/kagaredi.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a84ae982b---zixakotoso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cynoculars+manual+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_off0000b5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F2 10704 bytes
SHA-256: 88558a4e09547465e8c2cbefd863fa78fa8dec81b9ac20e64f1c0f37784bc066
font_01_sfnt_off0000ce82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE82 14624 bytes
SHA-256: a3d1fc76c58e0bc0d990771883fdd95e48b1b8f5361f9b3d1637b53d7ff5f435
font_02_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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