Malicious PDF — malware analysis report

Static analysis result for SHA-256 0997abac1fb73dc9…

MALICIOUS

PDF

100.0 KB Created: 2021-06-12 04:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 73c94fc08c0df102b0ebf5e71389e931 SHA-1: 5d03b6f38133ca6e86f3a0f6057386b2059910a7 SHA-256: 0997abac1fb73dc9f570232f2ec03905622539e212e5fd4b4f385a8fa65e1cdd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware delivery attempt, as indicated by the ML classifier and ClamAV detection. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into performing an action that could lead to further compromise. Numerous URLs pointing to potentially compromised WordPress sites and disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://laborke.ru/uplcv?utm_term=pradhan+mantri+awas+yojana+2020+application+form PDF link annotation
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160704ce34cc35---xadilanefita.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/caa134fbeff5849b00ec1ec0541472e4/99061467554.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/64593316187.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93da453263---sesira.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/vodunanopupimiso.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/55245532230.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/32bd4c4523ad49ca1d98afe64a372645/xotegixupewenome.pdfIn PDF document text
    • https://coevent.ru/upload/files/94810293499.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160719e4a55cbd---78349282026.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760902cd666---xojaf.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/93iti29q81291jaquaneig8117/93835492868.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099feff21d4e---29841368114.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/fijejukikav.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59160768b---zovoxufeku.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee372e376---21907850679.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/76765563176.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60603f5a0---6847686699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 5940 bytes
SHA-256: 6c165b0b053465c8be4270c28a70fad84048a80bc977fdb1e5ea59e6eae909a1
font_01_sfnt_off00012a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6F 11248 bytes
SHA-256: e749bce07e0ed80c42cbbf1bebbc46b9f11ad328b9a4410e35336cca37d640f8
font_02_sfnt_off000150e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E8 16336 bytes
SHA-256: 5665185e49d4fa2b49996dc0469edb7b4416fa9228f945c916c9d329e2b947de
font_03_sfnt_off000166f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166F6 7372 bytes
SHA-256: 4363f029dc95cc8ea2a07f185e431433643c08a4f1f25a4ea55944626dc17fc4

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