Malicious PDF — malware analysis report

Static analysis result for SHA-256 3409680f77b9d81c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 20:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e99bee2c81fc78e2e0bfbe534dacbfdc SHA-1: 7d80add5ccd4613674ac26c13355c0a6438f85fd SHA-256: 3409680f77b9d81c971c45e2e30f271a023aea069c7ce63fb3116e4a6fc25748
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=ludo+king+money+mod+apk PDF link annotation
    • https://cuatudongsaigon.net/uploads/files/97534655864.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/basefe.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/gekeginuduj.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/dakigazezubi.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/7634205069.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/94415898529.pdfIn PDF document text
    • https://dejavuruse.com/userfiles/file/86003949910.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/lelisotezazamufidukiweba.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/84256667913.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45893887318.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/29973029151.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/visumekegeker.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/rebuv.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/130f7846241bdd1187ff08a33940734c/10909520461.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fef2c3c53c0ddf4bb9769839a52b9316/nosigubi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/aqr2a9hq6jlq6ns9tbd1a6gu00/56228912493.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/40842354051.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/fijozogoxorifajudagage.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/zuwitelefewogafeka.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/d7a32ff3eebfa00de5a1ffe0c148d6aa/56358634.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3fcec5762---vupuwi.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/s2crpbn8pitq3svl5vemq18nii/94665827561.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_off0000db70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 19204 bytes
SHA-256: 3619e95235c51361a0b3523a0e3f74ca9209f564e28c8dc47db41b9a68646e10
font_02_sfnt_off0001257e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257E 10584 bytes
SHA-256: f714c5751e84faf30462b7087616186bad997da8437c694567afebf2fb2dbd29

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