Malicious PDF — malware analysis report

Static analysis result for SHA-256 a783ed6352dfe57b…

MALICIOUS

PDF

88.4 KB Created: 2021-09-11 21:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 92aab6657fad4836f70568ab2967b5ea SHA-1: 7356ef4da6a0eb7ca654bae67e030615ba03b9ed SHA-256: a783ed6352dfe57b5b27a645e51a5ccf99476ea9e84f9101d5d4c995f30a5809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The document body is unreadable due to encoding issues, but the heuristic findings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/467dd624b6518adff3213294dc399fb1/7114152575.pdf In PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/busagugadavariwezi.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/96374629803.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161333a81c18bd---pefazepidadamokirex.pdfIn PDF document text
    • http://kelvista.lt/images/files/50501995458.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/pomowuwikavizonewa.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/54814023946.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/4970b61ff0603b0cec6eacd5fa7e9bbc/24457836872.pdfIn PDF document text
    • http://elitvorota.ru/f/file/69994652802.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/vedaworazuvoteliz.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/17510558141.pdfIn PDF document text
    • https://rtquery.reitoken.org/Coaching123/images/files/vufiteraxatuwevibolif.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/2640542431.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/61293601927.pdfIn PDF document text
    • https://nasikampung.info/contents/files/nipavexe.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/87872169950.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/35933992887.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/82421250322.pdfIn PDF document text
    • http://generaldistco.com/images/file/wapirozamosovel.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/37680644352.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/xikinusimirixezi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613460840151d---15305119259.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/narevurevamoketukebi.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/sunonozutade.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/bajeratelunulekopeguretaf.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/11290834993.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/31572874759.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9b71423e53513329994947872d9e5acb/jujapivasolip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=phrasal+verbs+out+listPDF 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_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 10408 bytes
SHA-256: 8472f28af771d6f58317bd75ee34da8c5552da030b5d6ab80a2884ea2117092a
font_01_sfnt_off00010bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF5 18552 bytes
SHA-256: cb6ee48142706bc4b53295f39b4736e2fa38d518187439c3997dfa2fd9bd9eb1
font_02_sfnt_off00013b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1