Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d3dbedfd3e51f78…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 12:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dfb7acbb305dc8d4c2426bea67c15aa0 SHA-1: 21bdf8e586b7cdc7f732f1e715b69b8e8eff2cf2 SHA-256: 2d3dbedfd3e51f7849ebc413ed70b46fb79ac7665c906f54588c7492316c81a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress installations and other disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple PDF links on compromised CMS uploads indicates a coordinated effort to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad07fd4b5cb---sevupemoj.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/901eaa9bd9500303686949cdf3306f37/wokagaxorirefujilibem.pdfIn PDF document text
    • https://bataretak.com/img/files/file/26334692393.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776372609ab---94930193605.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/guxopulonis.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a11bbfc7662---38386009370.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c4c349eb7d335e1259771414f1d95463/84372239357.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/24760995784.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/46d07abb4d26a55d1c565a29e94996d3/xogujofagedakagote.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/simipigegapudigupaguk.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/qavn4bhmomr837nscfvedrlk3g/nuwoxafitigukibifozuzowir.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeba74f111c---fepage.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/9f5c8f20cd50e0dbffb08ea9411c1b94/97495917062.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b1db1ab7---42190237174.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7fbad07c9a173fdcf6828910147876bc/27786802735.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/77776899988.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/nalfv2kgicdlta5d56ifq6soht/58681028850.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/82919972538.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f3b76b2ea543a2f0295ca68036f2d96d/30691159820.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/f49ed0d589505755aec222d1a9606c45/geguroberowak.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a3f7a543---68154041722.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cldmelq9fud3ddulb6f5deiinl/fakamax.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/796dqc0d6nrcut65hu2unvk72f/vunamorisi.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c47012c21---1546003571.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/92177446671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=baking+cold+cookie+doughPDF 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_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 17728 bytes
SHA-256: 10195de83ddb6d7b73c6792255a7dfc0452467c35241911ac060c5aead80923f
font_01_sfnt_off00012631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12631 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E48 10528 bytes
SHA-256: e8efb69d1b3f36c1867d9a0469b0e6197cf3b8f8bb36c621a29be03b974cd71a

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