Malicious PDF — malware analysis report

Static analysis result for SHA-256 406d845656443b80…

MALICIOUS

PDF

84.0 KB Created: 2021-07-19 17:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5afb6f95539c8032833004ab2ced114c SHA-1: 214820fccab4d9b551a1d4b40db1340ab44522a4 SHA-256: 406d845656443b8003f9765b706ad0f86bb55642bd093ae12c167aa8f977b471
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely used for SEO poisoning or to direct users to malicious content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071df2dbf7fc---nubog.pdf
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/risifaxorilizosimot.pdf
    • http://currycornersugarland.com/admin/images/file/79038244834.pdf
    • https://namlongadc.vn/uploads/news/files/zofitavusegeneleforeli.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/bc5fac6b5a60a9c20bec9f3ad3d32343/wopidijasazazuzalifaxop.pdf
    • https://elesud.it/img_pagine/file/63896675011.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f88f2da898---goxalegom.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5a22f5a6---88174862097.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a8d2d742971fee519432d2a6c8d9cc6a/71913906003.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160720cab9c51f---76921047843.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607de88fa522b---leboriwopogatobutumuxodek.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/e300b5fc697ba25a1031cd8e5a0ee492/nenuredakerugiwadijuto.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/ravetelifuxumerinagatizi.pdf
    • https://bloomlight.pl/_bloom/file/18793986196.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/uhobjh74frh2kcmnk3ndbn93g3/55932281189.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/zojixojobadafijelud.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e524278073---834732958.pdf
    • https://eternalbliss.net/file/2076497778.pdf
    • https://arerp.kr/data/file///67780090795.pdf
    • https://airshow-bg.com/file/fadebijiv.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb4263d22---nuwuju.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4efb755e9---81687927695.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16084da0b88308---93912819051.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=dragon+ball+xenoverse+2+how+to+get+to+level+90
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b9.bin
3118d8b27a9d7d32183072e6eb5a29ea98f990db05ab10f04af99777ff2e9eb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 17616 bytes
font_01_sfnt_off000110b1.bin
f611d08527d56047496b1c38e8fd0a0dd8498eaf94697eb8950a4f8a1b840968
pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 11100 bytes
font_02_sfnt_off00012ab0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB0 16792 bytes