Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae88d7699bcd1fc0…

MALICIOUS

PDF

127.8 KB Created: 2021-07-30 06:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 38ace79125e1a5194a966d2d8fdc7d5e SHA-1: 3105b3b5ab8d3003610fdb20f0105cfd586da68c SHA-256: ae88d7699bcd1fc045d1956fea280a0beedd69e42da30c9f0ef4aea2fcf99770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm containing numerous URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04313b077---3702816677.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085afb670518---84183316099.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/672d0920c7a90d20347cf3c7ea0fcbb5/57001715735.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8l791fajtfci12vl0bp4udug6u/2440191684.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc05e4438e---gaperobemijej.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/sagixuguluguj.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/bevigukofazomimezeda.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/9ns2rcds71g29p79av9a476oqt/59088611922.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/falijewo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48cada895---29046773313.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/sisotovujafemiduwi.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/48654237967.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/vazemomufibutaxakejugera.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/zuvukudani.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070402b8c273---rifokukida.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609787e460030---70520918072.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/vagapadafitapadezotemilog.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/87055929407.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/7fcd077c46f806f4bfcdfc980a67cf18/71321492226.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/vumalimowuduk.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/kinamisiw.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbea5d39ce6---wovapojebuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fichas+ortograf%C3%ADa+2+primaria+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_off00018ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18AC9 19912 bytes
SHA-256: 918bb4bc94bb10681a08b462a945fe43c18b60897c712b4facc14ec26cddeb00
font_01_sfnt_off0001bdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5C9 10944 bytes
SHA-256: de871c31ef870cf3b64d7559672afccb96e94dff7b6746928f0a3a0214a0be36

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