Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbc0ac7cc78b02e…

MALICIOUS

PDF

85.5 KB Created: 2021-07-01 21:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 02e571bc640fbf37d45e85d89d848510 SHA-1: b54a08b57d40967eb49e969669cb0c565d213dcf SHA-256: acbc0ac7cc78b02e71c7040273ea7c0ef192bc045cd1776fd3db9cb5da96e2b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to malicious external URLs, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=pythagoras+worded+questions PDF link annotation
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/0d1be57daed3239cd7827ca8e0e8b132/wukawerizobet.pdfIn PDF document text
    • http://mesterek.net/tmp/86693136917.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/54514914708.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2eaf142c3a3e6fefda167fa9b05e0d84/jamudo.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/f145a8a35ac3e970423d907f4807c299/83428801674.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9c3be5853---41230410681.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6d69b1e8---berelolekarokulikepogolad.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/97234933922.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/wevezamuv.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/d79f3f8205c399cab8a52a41360cf938/8606092470.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/dijevujizeku.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cbd6865d5---betozejaxewada.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/73b4e9567d2be3bd41dd6b9c8693e347/36391647226.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ae4a4f2b73d4fa6a4d28a8aeef7f6a0e/fefowerejiwebokorid.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7443b9d1d---pezonejuvebevuzakovuwo.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1spo1edggp4iq8kfafhugu6otb/53113387978.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/sokorawikesigonu.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/9r9229h3gmogt7t94cc0b3lfsr/14123766748.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/sututajoxizexus.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbe244013---18132727143.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/laxaputusinutaro.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/atnsro3o5niqvefhnipqjqmo53/6823761268.pdfIn PDF document text
    • 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_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 17352 bytes
SHA-256: 180fb6c5e03557010a48ef68260da3c94d95c4e560015d778a981666bc568017
font_01_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 10928 bytes
SHA-256: b659b7ff902efd3f42ee5c806ae220ba5b4bdd8abd7f917a30d2505d50701f66
font_02_sfnt_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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