Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4528f902b69562…

MALICIOUS

PDF

84.9 KB Created: 2021-08-21 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 622de8f8ca8dbe2cc9954a768de1268d SHA-1: 541d66f40a9b21b406b61c29debe1622f5103413 SHA-256: de4528f902b69562951018fcb74b94bded47c0b7fd36c7947159af5da70becdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links point towards an attempt to redirect users to malicious content, likely exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laborke.ru/uplcv?utm_term=the+art+of+saying+no+damon+zahariades+pdf PDF link annotation
    • http://tuanayapim.com/rsm/files/finikokus.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2f39219fb---42657011839.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/96163474151.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee756ea7c7---29805435333.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/47fc33e8e6eea30523db9337c2febc53/zibokapoge.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/79949520562.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/74430106382.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47c0628751---93063182208.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/tasewazuvitidudoli.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210601_C98FF9B7FC977D5E.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8940e8e9---lajatedofoveragofapu.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/14812573988.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/3s9tubekjdm8qk2h29n43jh7qg/20704907383.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/bejobanunojutiwomirorulun.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gafujinimoripobidil.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/4f55602d6208b93f9032574dc0e566c9/falatato.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1476206c353940644ac8d0043083f44b/45694199285.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/85530022209.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a122d8aeaad---lulezososodelibunifaki.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5db0ed59---xoniziwatuxolowubedalaj.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/narifadafolebo.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/tizapuponuzokezegezox.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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 11036 bytes
SHA-256: 23a447abedd300ec94029b4cd53ea76e400b7be76b3b559328a557e16f2efad4
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001178b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178B 16816 bytes
SHA-256: 3a48efc04d9f9aeb5a4d7cc1c30e8d302315fd255e9cc317e1d4bfd8053e6f05

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