Malicious PDF — malware analysis report

Static analysis result for SHA-256 a20e365e84ad5e5c…

MALICIOUS

PDF

86.2 KB Created: 2021-09-19 21:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4533dfb30119b87144b5073420c9533a SHA-1: 0644f7dcebcd14c6bbcd30229c93822f4faa616f SHA-256: a20e365e84ad5e5c80897cae66e1030b873dc7768eeb12543b210967d9f61ad0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the link farm heuristic is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://renhedc.com/uploads/files/202109190759112299.pdf In PDF document text
    • https://twr1115.net/files/fckeditor/file/76316200873.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/bosumatizalu.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/panefaga.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/xonizudutokafajitotug.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/45369992996.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/41298177761.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/28772137288.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/20176827696.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0e89b4bc3---zudizuruxexome.pdfIn PDF document text
    • https://best-label.com/upload/files/rivekewumawidota.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/38524198743.pdfIn PDF document text
    • http://yanartextil.com/firma/files/vigeg.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/xevagerojulabajo.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/zivosumajax.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144dae135ff1---16030330670.pdfIn PDF document text
    • http://epicridesnepal.com/files/woxoli.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140f459ea575---jirewekexijigizikomunuw.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109062112035184.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d3e028635082e79c4a0a1e0d08b66f31/88037884836.pdfIn PDF document text
    • http://puisan.ru/uploads/file/113181403.pdfIn PDF document text
    • https://cargotavio.ru/files/file/80111086184.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/zejebogidajilufajenob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=putting+a+refrigerator+on+its+sidePDF 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_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 10584 bytes
SHA-256: 145947d38345ff8aa8e77e31372887f93a9b2e170462f751375f0a4ebb1f89f6
font_01_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 18124 bytes
SHA-256: 127233ddc27d91f3a37cb9aacd08e2c786e2295cfbbca0f6a032448f3b8a143a
font_02_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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