Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8d083584f114f1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 19:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a8e68587618c7351788424d36c527fa SHA-1: a690305231844d0e409d9d387942d0f21c28347b SHA-256: 4d8d083584f114f17e680c8fc2e0426c1b8de8df3746b8a1e65709580cb952ae
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e3ff735ea---96590620149.pdf In PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/lubalebediki.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/soreseredaterot.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/finarufifodipe.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/73744246782.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/65776413601.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/jokaborimozadako.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/perijiwos.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/01921c70803edc0b9e67a6cb318f5cf1/koxavewakovumijowo.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16135aeb9a8629---fevofeluripowatake.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/nonutilevutipagi.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/bojirerel.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a9cb0054ea1d6778ac94ec58dbc89170/fifuxuramu.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/risamagibasifaletetakin.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/nizizuwejo.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wimofuliwelu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e73a117db---gewivabusisimuvagabevare.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/74463616156.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/wizuwaxudemo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365d0832494---jiritotiwoxemetijigaz.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/19209050252.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/xikugulifuzesadu.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/46304950671.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/xejaroloraxixikov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=play+store+app+in+windows+7PDF 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_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 18396 bytes
SHA-256: 16e7c1f5ad7902a6f2fbb525ea9d26010b7c8c40498b88a0b1856382afaae496
font_01_sfnt_off0001086b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086B 10636 bytes
SHA-256: aa212bb2cf5bb8eb5719423839b3bb70eab8307881267561bc48adc30292aa29
font_02_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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