Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4a7bb541dae3cd…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 02:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 625586a3a6f1a515076333a9aecdc5b9 SHA-1: 85dbf22835f5790bccce23abacd5dd122e9c5d99 SHA-256: 2b4a7bb541dae3cd2b08310403308b9dfe4804b21211f6799178dc1c1f43d599
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous URLs, including those with UTM parameters suggesting tracking, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=passengers+movie+torrent PDF link annotation
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351d9719d51---98821574091.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210915221007.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/mosegevalubozevu.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/merevodawadokozuxu.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/64781780031.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/dd280bc47c744ce4a9e7a8bf84d3f626/wazavinomobuliz.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/94303670167.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4e445078---zuziwisalago.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/gabasutekesutajivadite.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5jbpg1l834d5rm2sppe6gbahj4/nazeduvarigewagunufebemuw.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/11419332747.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/vafurojafalasogitesuzawa.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/zinowadeseloxaweba.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/23615475604.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/sovevide.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/56539086852.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/zuzevewazewolekif.pdfIn PDF document text
    • https://avela.md/userfiles/file/mezemowuwozanabobupum.pdfIn PDF document text
    • http://lactopad.com/uploads/files/85487480145.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/lujemukapoladipubizulex.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/lusabewitujibez.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb6bec63f---89085710860.pdfIn PDF document text
    • http://terfigyelokamera.info/files/file/livamujawasigojuxa.pdfIn PDF document text
    • 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_off0000c16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD981 17108 bytes
SHA-256: 5455a79ea5f8a5da41dd8cda3b2b34306d3aa4a183346f25a8b7f73edcedde2f
font_02_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 10472 bytes
SHA-256: 85d1b3fc694bfe70a61ae93377986137b962df0ad83050b8dfcd312d6d60a3e1

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