Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ddade3e9db93ec…

MALICIOUS

PDF

67.4 KB Created: 2021-09-30 13:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5316886582fc562490ccee44aeb2fa7 SHA-1: 986800d094a2204d2c6a7c93b1313373bee61bf2 SHA-256: a5ddade3e9db93ec3878b7c6fe6452f394cb7e66579b708c19b4612e21bffc5b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's designed to redirect users to various external sites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier further support its malicious classification, suggesting it's part of a campaign to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://archism.ru/uplcv?utm_term=you+must+build+a+boat+apk PDF link annotation
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/93797724348.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/xetada.pdfIn PDF document text
    • http://aimic.com/userfiles/file/12995236004.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/wemagadezakuruxezekorex.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/xaporagawirofasopavug.pdfIn PDF document text
    • http://maksimetall.ru/files/jerure.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/11047723448.pdfIn PDF document text
    • https://emailing-online.fr/uploads/userfiles/file/47085126168.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109130011545100.pdfIn PDF document text
    • http://winso.tw/userfiles/file/dovedebanazovawamakaxored.pdfIn PDF document text
    • http://labotinnghia.com/img/files/fapemumawikuwurex.pdfIn PDF document text
    • http://poexali.org/static/image/_u/system/files/92861127028.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/cd903d64594186f0b3457abd0d762bb5/58574437110.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/kidizi.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/18842471184.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/96512318243.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/22052333949.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/31aeb447fc8a7caa387fc5cdc181bcef/97842938863.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/33673926629.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319e71ce720---92921287899.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/donunasasodej.pdfIn PDF document text
    • https://hgb.se/filer/file/nudigawalosifapew.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/73537078452.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_off0000ad13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD13 14212 bytes
SHA-256: 4f15321d30b73d15ef9585f46b7f1d03046154685bf89b14abb47065cce5eeac
font_01_sfnt_off0000d026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD026 10532 bytes
SHA-256: 1bbb7ea6ba09b34441b7e57b30f29d006ed536a0c6b1b47a3e9623e30d172e9e
font_02_sfnt_off0000e7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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