Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1182c902abd1ab4…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 04:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a54875c1777f295d562be299e29fb8f2 SHA-1: 282806d15ba71fbc19ff58c6c12671c5dcf1ab8c SHA-256: f1182c902abd1ab45e3ae78f96233e1458a61fe479f22f1c2fa99303d57f1130
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common phishing or malware distribution technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://asiadomainstore.com/userfiles/file/wimigaduli.pdf In PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/834a6b4a37603257537180efeaafab42/42935401806.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/viwofoluzefewalusexorij.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/98392649226.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab806f354d4---60993564914.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/41899524911.pdfIn PDF document text
    • https://tonitomov.com/picture/file/75932323996.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/2368809860.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108140407587284.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098748d9c6e3---wowudixekagefomof.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12aca2fe3f---50866441498.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h3l6c0q5rmbct67mem39njra1u/xarezizemiwadir.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/49105430842.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/funibikuga.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/84791795566.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/mutifunonekugami.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be803c2cb2---duzokuwuxevopevesajuve.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f442e7d76---kamuz.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/mobif.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073d578057dd---situwekotaxuwepudukofatud.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/pixasizerigagedo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/49811595328.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/dekibizuzuxerewunuxipu.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/wivagev.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/34675325047.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=armadura+de+dios+estudio+pdfPDF link annotation
    • 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_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 22384 bytes
SHA-256: ea2fa4bd3f3bc611f9a13824dc67582bcf33d939a332e1b00d9366010fec3563
font_01_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 10588 bytes
SHA-256: 6b5bd27dc5ed8098d269d37341573f899a7da0170028815b76692698ddbaebb5
font_02_sfnt_off00013641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1