Malicious PDF — malware analysis report

Static analysis result for SHA-256 a539a4968e524935…

MALICIOUS

PDF

85.7 KB Created: 2021-09-06 16:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d40b0f1de476ecc63014467a5c117919 SHA-1: 3d71c9cb122991226106bd15a7f0cdf7febd5e38 SHA-256: a539a4968e524935127f7a5758b9c5f3dbf72d418e9c7f902f1989b25deeacf7
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and potentially malicious domains. The heuristics indicate it's designed as a link farm, likely to trick users into downloading malware by posing as software cracks. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=nitro+pdf+full+crack+khuya PDF link annotation
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef93e80176---19413679192.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b49486cb11d---favosimokajomegawexu.pdfPDF link annotation
    • http://homeopathyhongkong.org/files/buviwanapasinalosufife.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e6213185bd902a89532963bf63fcf580/lonexufexew.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/bdsn4uj8nbn2v4d2g6nuf3a4q2/59561752506.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/26344731491.pdfIn PDF document text
    • https://mmszke.hu/files/file/wuvikamewevisizu.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/52127717272.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/6428593059.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0e26114abdd18e4c26d73e5339267672/sulexelunewimejeduwetugu.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/56521352571.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/xixidekokig.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/55495355477.pdfIn PDF document text
    • http://elskenecologie.nl/files/forowa.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/86943068170.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/6526135583.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/29809131298.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/43979702031.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/56287737236.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/28283726980.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/5d0f8982306f761f42c2101f2fecda80/dagap.pdfIn PDF document text
    • http://contactconfiance.com/files/files/sutemubamabefot.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607437af93c50---zuguriwelud.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d6342f36c0538a9774b7e039c2eec0ff/libanuxomitipid.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_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 10596 bytes
SHA-256: 2914174b2a03387a7515bdaab5d92d25cc6979adceff0f456196b072bc01ecf5
font_01_sfnt_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 21400 bytes
SHA-256: 0a3d75a9abf66e228c85fb8b96e7ad6b87a81944ebbb501eea7c660c9714dc11
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1