Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af4a004c93f8409…

MALICIOUS

PDF

93.3 KB Created: 2021-06-26 17:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3da6db3d22f876b2e53d3105f99c82dc SHA-1: 12a0cc6012b721b06479bcc59f07e9c81db2bb50 SHA-256: 1af4a004c93f8409524285d14822719e1387a65f7b67ef375ce7bf7cfba5346d
156 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites. These sites host PDF files, suggesting a multi-stage attack or a phishing campaign designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e396e1eaf---gijixi.pdf In PDF document text
    • https://immobiliaresancarlotrieste.it/file/65371002627.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mikenakitakaw.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd1670f08---10371703233.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-12/images/files/72432076007.pdfIn PDF document text
    • http://pronobile.de/catalog/file/68057470812.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/r09d9s2dm8jsnbdlt5otk2mq1m/95226066228.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6e8b4e855128daee77ad928c14084fbf/98841001065.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/eb1ccf64c5f5e3ccc68cbd5ec2091acd/36583376056.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/vewabuzeva.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf5dd3b08b---tolejelerujofalapi.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/bisuludivadutepisawub.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160781b5a11ea2---mopesemazojuxarid.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/vagazugajotupebuvamori.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/26171771871.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/filuja.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f75719933---68609793661.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/43637793723.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997bb935598---1930026084.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/659806229.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c3a3bd1f33316497455b4b992a215dc2/76551228897.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/fewisogagibivig.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/26f21c17a0825a31dcf8697ca1209e9a/35803742510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=mexican+mother+in+lawPDF 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_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10508 bytes
SHA-256: 86d61b37a3655c4f74cdc7c0f3278e678e13b3ef42f2c5ee25da533d2b72cb3f
font_01_sfnt_off0001222d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222D 18132 bytes
SHA-256: 2ccd54911e00a1fbe3b712ef507f86839477e70e134d2ca282a0473114e97d35
font_02_sfnt_off0001506f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1