Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4f8d605551565c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 08:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 356905a4d7f788e4d2edbb971d500ba8 SHA-1: 7ea20ae49ecfce61b968625700b122315cd0e4d8 SHA-256: 2d4f8d605551565c80d118d48370c11cbe53f384395701ba3b35f46b4d25b63f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the PDF and its links points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=mobdro+latest+version PDF link annotation
    • https://dabanbep.tanglehadong.com/upload/files/joxaropobalevozekibita.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/8128304403.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/vofeluxapunot.pdfIn PDF document text
    • https://tebra.si/userfiles/file/burofu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cnj0uji33361mj2u23dp57eb2r/1373278964.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/golaxuzinaletugitufimep.pdfIn PDF document text
    • https://razredna-nastava.net/files/raxuzofi.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/021937231792.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144dfd99d029---penofuxot.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/radetolimokenab.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/10644627442.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/judavedesa.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/manodoripomu.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/77916958632.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/88789719006.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/65029167462.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1faf3604b7a2329f3785c49633a397d4/xutajunivunofiguvelep.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/24186961401.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419cd08f12c---2935620753.pdfIn PDF document text
    • https://unaizahic.com/Files/files/1382399122.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/48110366839.pdfIn PDF document text
    • http://www.bash.cl/media/file/duduwofuvuzumut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614443041d2a8---mineweva.pdfIn PDF document text
    • https://apra.pl/files/file/13529232010.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_off0000da18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA18 10440 bytes
SHA-256: cc29bc2c5dc6766e4bc7c3951a928c077b4677c5321d9c197e2a2a34e5b2a296
font_01_sfnt_off0000f1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 18024 bytes
SHA-256: 72719092e1806dd7f28c802cdf509b870c323c8a1cb74afaa05ac78d2c6cb6dd