Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5f6094af3c82d0…

MALICIOUS

PDF

78.8 KB Created: 2021-09-18 05:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c34e5867ded98cfbe490421770ea8ae8 SHA-1: 3e01ca49c4b56161c9e5b23c9f1ba50f6a712363 SHA-256: 3b5f6094af3c82d0091fa74f6b2a45e40112e026f337d453af063e8fd198cf53
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple websites, some hosted on compromised WordPress installations. These links likely serve as phishing lures or distribution points for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9716

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://crewmak.ru/uplcv?utm_term=android+game+save+data+location PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cc450302---tilirikaxusorixugomibiz.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/nebogununupetoma.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210902_A05D6784D743A88E.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/202522b9d24e7c8cd851cb79344ddc9a/78054048571.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/10424094655.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210914160511.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pizijusuvufev.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/95005700672.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140e52c6bdef---kovalagapu.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/voweropin.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/45906779050.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/85106313622.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/buzevukelikinokijukolegan.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/xedofetalupedirirutodu.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/11651705557.pdfIn PDF document text
    • http://nemochem.cn/upload/files/18302109645.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/zalota.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/lagunurefe.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/lelafexinin.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/pemajeriwajuzitapumuwa.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/pizisekinokulopuriguli.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/65597492114.pdfIn PDF document text
    • http://rld-carbon.ru/file/jexadujozafigojavit.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/faluwu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bedf7929be---wijirakedefa.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/mumomig.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/98173033077.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://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_off0000d411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 18076 bytes
SHA-256: f810a8ad59a173a56761e2be79894250616e99eeb524c9b7b5fd1299a37a6ce7
font_02_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 10760 bytes
SHA-256: b104012fd2a0b5695332873607d8df7b209fb39ad8834db321b96b4556984cf0

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