Malicious PDF — malware analysis report

Static analysis result for SHA-256 6912411f47d4072e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-09 09:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c4e8598feef4295fcfeea18ef88272d SHA-1: d377f788264f11ec34bb62df80c5137ef9c4a46c SHA-256: 6912411f47d4072e6e6e758dd19deced38397c7e5b2b3faf377f7f37c1b3ac07
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cisseo.net/userfiles/files/fiselidosisobigizupu.pdf In PDF document text
    • http://yomamasushitogo.com/uploads/files/tedizawulebikewifegawufa.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/43720603493.pdfIn PDF document text
    • http://underbutter.cz/download/foto/sikagijeroxo.pdfIn PDF document text
    • https://frisch.ro/files/file/kanivapinawafejevepon.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c53875b23---34998989247.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/fijilifore.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/nowimivufonefiwowutera.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/jutifakexuwiruwivuboz.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/93118708570.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1644204552613791af3a6f2.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137a23bd9b3a---15304979481.pdfIn PDF document text
    • https://businesslife.com/content/files/weterijawasukazobez.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/39777137502.pdfIn PDF document text
    • https://ip-pharma.net/data/files/divuzemilaxa.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210902_59EC10DFEF1F460B.pdfIn PDF document text
    • http://skmsm.com/userData/board/file/vulew.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/82863376862.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210902_160621.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/88rcasgq4e31fl33l07rttgoo0/xigezubafisi.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/gedikawerubisoramila.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/cafd65fe516ba1a248eab6e7cbcddd59/87191357163.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/83786539888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=creating+a+game+in+android+studioPDF 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_off0000b353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB353 10676 bytes
SHA-256: aab778283a2fab30ae38abab4ff7c9c2f826244d94b382e17f431a34ebe0aef7
font_01_sfnt_off0000cb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB98 14968 bytes
SHA-256: cd59a620250b33f2735fa6beecd32e7a61f380806f5237572f8915eb53b4cc3c
font_02_sfnt_off0000f143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1