Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a2308e327e9b13…

MALICIOUS

PDF

95.8 KB Created: 2021-06-27 21:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01bcbe0be6c459478efe57f4ad92df09 SHA-1: 1c8803f780a987904a149e9603847a6e37574dcc SHA-256: a2a2308e327e9b13e5e6ab1d28fc2e5c3f58fe766ed5e3813b149ebc0a804708
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious websites. The presence of a link farm on disposable hosting further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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 https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41d034e279---lubusoju.pdf In PDF document text
    • https://sjalikave.hu/pictures/file/neputi.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/nubolutenuwupu.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/saseputukuzilojozivapet.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/40425465278.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7844a563b8---2566447937.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7379558471---kopazulobu.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/biwoduwepabibif.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c91616d5b59---58262698380.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/11406598894.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160853e22468d2---gejukizutogoze.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d095c6a87e9---welifubudenuguvojuvuzuwew.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608695189130e---37110304388.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c79794ce35f---fodafusuloz.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/abeiul510l3qbc2fqe3fbs5bvt/ludokelodasepotokixido.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/49098340895.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/zatapesovarutig.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b2beb3475c9e6398b8e1e7eaabd9c9e3/79403125404.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc955bafd---4049377526.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608293df6dbb1---36741571024.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bac8761a5---lerogesededujolorujelaxi.pdfIn PDF document text
    • http://fitviewer.de/files/file/17563554237.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/76060076771.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade5eaf6e---76119842914.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/rsf3jkb2dfmkbvurvfqm0far7q/52661367993.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/narexasek.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7406ca028edb9c2ac75d2e33dac52b70/61422460765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+missionary+position+christopher+hitchens+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_off000111af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C1 18212 bytes
SHA-256: e454104e7b91195e633881a3fe4c1f2695efdc825181bf03d0a95689c95e3a2e
font_02_sfnt_off0001596a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1596A 10916 bytes
SHA-256: 5eae8634e9b516e52d876de542b5b5ced873424b58b74d64f225dd826f458755

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