Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f84bfd64e37fb7…

MALICIOUS

PDF

99.5 KB Created: 2021-06-29 02:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9fa319f07543ee1397d20fb25a1acb9f SHA-1: 22e8f5662621455757b7950590e63067ab08d3ea SHA-256: a6f84bfd64e37fb768fa3dda0ddddd32e6702ac09e2cee9cc4d082043b9fc426
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains numerous embedded links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and embedded URIs are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38871dc64---62564638490.pdf In PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071739890fcb---xerinerodupibofolifobavuv.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c81c450a7f9abb66be03a02e1fec7dbf/77770758055.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a0d4028a276f95c1626aa4d0993d6d29/jiganipigovizuluri.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/fb4fff1ea7a54c6b425f6e38a2ec62b8/lolej.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a172682c0---zowijegas.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b5068d6d5---godakigulomevuwite.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/47713227624.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16096922a65b17---sitenibuvijesolenolik.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/80453942663.pdfIn PDF document text
    • https://samowar.ch/upload/file/21524501232.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d471609abf8---39215888318.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b834e95a842---xoxofukejowedotas.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/jql4qdv6n4ajdgpif2h8gobr0r/4224924675.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/41ujuvnro0m7rng99e9kk3irg4/tufinepipilafiwasilezaje.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/88182148839.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/dotejewizoverufazarukode.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/25k14o332cjo2lphnrv8lutpbs/17410035580.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/2562c4cb1425758421ede0635cf98669/doduwupamabe.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d8aaefd1142bbedc8ce2e83f87258f05/wodup.pdfIn PDF document text
    • https://luminex.pl/upload/file/zaxifesaxoku.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0c1db17c1---gaxakefej.pdfPDF link annotation
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/8a479ae03c858e7fc3e0be9e2ec5c87f/2344852538.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/juberelojizilub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=messenger+group+video+chatPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00012894.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12894 21996 bytes
SHA-256: 8b14111c810d2e3e6a7f9d1b6415a55b69ff8413394d4f451c6c07b2356ad007
font_00_sfnt_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 21576 bytes
SHA-256: 306d77c1040c6b7de633c0cddf77f108dc7ab7944c44f5f74a07db8e38f6beaa
font_02_sfnt_off00014f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F15 10908 bytes
SHA-256: ff7ab1703b0a1d4d54f05b607c208bc47553db29be575bb30f304ef095a364a8
font_03_sfnt_off00016820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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