Malicious PDF — malware analysis report

Static analysis result for SHA-256 819e43cb3f88eb63…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 12:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6a08bf041434792e82c454bd68173a9a SHA-1: a8118a80ed1c3e99d41a15049715c1c69c75977a SHA-256: 819e43cb3f88eb63c51521b5e52497812110bda44d480a7de24588f2d18c2117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan distribution vehicle. It contains a large number of external URIs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns strongly indicate a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=benefits+of+cashless+economy+pdf PDF link annotation
    • http://moveworldtogether.com/datas/files/dazipaken.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/rekuvubulafomugujap.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6544b9b89c---13500036389.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/67c79f653c73762ec4f2dc511010bb18/kegoxowusavuladaxi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f0527b846---3086283893.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ja1phdl77oui7r45vtlmquq1bs/33204874400.pdfIn PDF document text
    • http://orthopediedelft.eu/files/lapewowokorijanazokij.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/2004783263.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/54765722823.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/f4n4prcuokoqh3c1hbbglc2o3n/91728152001.pdfIn PDF document text
    • http://domainecomps.com/documents/files/vitak.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6ef9a64e579eaf0ccff8f789a10635e9/dafexuvuxilat.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gukedi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16117e6fb17aac---xagilededo.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/gixer.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/fukinitav.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/98442066159.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/vifadowi.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/59386692377.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/hh1jochdp95n0sd0b21o3nm72f/denigowobometabanunigib.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef6a712f4---45589050389.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/veludefokisomob.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/bumabovozovizopoliji.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_off0000e294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 10952 bytes
SHA-256: a8e0ea08316ef9d61c6420bff9b7e7376690c54ce1e0ff055cc534cd86615664
font_01_sfnt_off0000fbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 17744 bytes
SHA-256: fc7092ee1ca7bd4d2b5c816662f9c3882215ab367014fb03d81575c0a25d8f4f

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