Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab1079f49792487…

MALICIOUS

PDF

166.3 KB Created: 2021-06-29 18:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d451c4ce8e46e299101c5bfac705d9d SHA-1: ab070172811093483ecc988e0d0de39f56dbc836 SHA-256: 4ab1079f4979248765eec49ea9d9589f4edd5432c25a955ab82858249b2c1226
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9087

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/uplcv?utm_term=gave+in+to PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c6d4487e2---57503203416.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f59bc6abd83ecf4cb242cb26bafb7194/fuxofumifi.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/68746251976.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/omrt9o5u86kkbm2bdk23h927a4/duxitoneravati.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10b8e2382e---siwudijanivir.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ddd83704---zivugefagunubitejapu.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/lomatomijipaxefobu.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/wubegogogisodisoveroro.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/6365b07092e7ee14274de68b5dbeb2e2/kasaxoromomogovetude.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/16400666459.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/48809261502.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8tvkpd0rt4qq99jnauor4jja5f/lipifoxuxagajowek.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fd5a53ab8---duzimatitabibofowuwupibi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1ef72dea---96363290803.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6e4e14a07---25126681528.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074264968ebf---92503208860.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/xejepuzotakerufojujubob.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lezovepidow.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/gepikulibuzologawatakim.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/429416c6078c192699c87540ed5d52a5/65842133557.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/s0019ccvv5ptfvsd2i62be00u1/89021637984.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cccbe77c286---17855255051.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/66847644599.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/9bad835a0e87f496887e191b31142bdd/kezidenujipi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00017058.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17058 36352 bytes
SHA-256: f0f61c6434efd8686b12dd1f302120a13e2892a68690c8cbf70c366d4b23f7a7
font_01_sfnt_off0001b417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B417 32048 bytes
SHA-256: b6c2eeaa26108ec5b689b22de4a083e7ecde045efe351ab037b0bdc39ac655f7
font_02_sfnt_off00020db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20DB4 9892 bytes
SHA-256: 856aa2acc974713a6f44418b226058c391d739dc4deebcd09c355209ddceace7
font_03_sfnt_off000223af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223AF 36536 bytes
SHA-256: 35cf34485bcc2233269c146af0e8f2e47395241f5bc3bb3cd4384558e381dc0a
font_04_sfnt_off000272f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x272F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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