Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ace27c2a08fae19…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 22:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 716cf0673bd301a5cd048ecc473164fe SHA-1: b3a25512058ea91acec370a275a3a0ea20b71d71 SHA-256: 5ace27c2a08fae19259c9213d0b0562e9703ed068cffc72b4a685d1d98b9f2c8
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm and a potential phishing lure. The ML classifier and ClamAV also identified it as malicious. The document contains numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or appear to be disposable hosting, suggesting an attempt to distribute malicious content or phish for information. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://myphamasia.net/upload/files/sifemapiwejepezijaxujig.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b0dfe11c463a2847aaed39f0a138d8fe/voxolebavarezijewusabi.pdf
    • http://notar-frings.de/userfiles/file/75192405862.pdf
    • https://cribpointonline.org/cribpointonline/userimages/file/30903869918.pdf
    • http://nagymester.com/userfiles/file/xakamoduduxu.pdf
    • http://krukaiart.com/userfiles/files/7101575420.pdf
    • http://nuovartea.eu/userfiles/files/xijipuziwunopavu.pdf
    • https://2winit.com/Files/files/29058210032.pdf
    • http://moneymaker-gold.de/files/46366837395.pdf
    • http://doudou.tw/userfiles/files/67155924190.pdf
    • https://melz-feu.ru/upload/kakokur.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/l23b1ust2gf1h1drpjom9b1uhs/9938172211.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/mugugaveporilubawoz.pdf
    • https://newsru.md/upload/userfiles/files/94984698653.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/jadedofanosagikomefabe.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/019tntt49u5fdu17ros3uaip2i/99096439687.pdf
    • http://geoodwierty.pl/files/file/63362326118.pdf
    • http://vonschickenfremont.com/uploads/files/43444614612.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fd28a3fb38be404b2eeedc8774227333/53083135257.pdf
    • https://upbilbao.com/ckfinder/userfiles/files/siriwewokogolapodunewi.pdf
    • http://lechioutdoor.com/userfiles/file/41747843954.pdf
    • https://kipass.fr/userfiles/file/63861353153.pdf
    • http://stauarchitetti.eu/userfiles/files/babuwinipufuzibubagewidi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=vpn+super+free+vpn+proxy+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 16792 bytes
font_01_sfnt_off0000f030.bin
e7aec858e29d2e629bba01633014b76564507e94c9061f541b1ac695a8de3ba0
pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 18604 bytes
font_02_sfnt_off000120ea.bin
9f9545c7e54c3cdb50a3714418f594f0dd12ab5fbaf7af34cf2cded88df7eb76
pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 10560 bytes