Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d1b3fc8e7748f08…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 01:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74fcfaaecee9897a33f194c4c321594d SHA-1: bc885efe5fadc95e28fe254352675f4649c4e284 SHA-256: 4d1b3fc8e7748f08598553af1c04e2453160f8c0b0b37c385464e478d9ae79b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. The document contains a link farm with numerous URLs, some pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. An embedded JavaScript stream was also detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://profstil.az/userfiles/file/kalikunegakubez.pdf In PDF document text
    • https://xn--49st2et51duvk.com/upload/files/48769826547.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/voxufiwip.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144e41793a15---10715232220.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/20586080952.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/23062c9f2a84010e1f4ed73c1726fbce/53861186683.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/27114411125.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/batixuzugekekib.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/fovigexisizimuvadezi.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/xebufofutolavoga.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/20467074259.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/23614684223.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/68544502204.pdfIn PDF document text
    • http://chpcentre.com/files/file/xadivuxosasufib.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/22100033284.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/1bcbea6ebad634cd8b17e6fed95bfc2a/sanepoxopedimerix.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/9448544397.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/sulujedoxe.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/gizesigud.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7dcc62971---rafepaxune.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/luterip.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/59907096929.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/40260572897.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344f5e9301f---85904693759.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/sakatisade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=best+free+vpn+for+chrome+androidPDF 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_off0000dab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB2 17300 bytes
SHA-256: dd7a8709868dbaad1ca23085e5cf10cb63dfdce27cdfb54315cb3273b885b725
font_01_sfnt_off0001071c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071C 10960 bytes
SHA-256: 78902435682ac1a73260275e11a223010e24257121c932940490461cf2d7c3e2
font_02_sfnt_off00012066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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