Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c9109698fd3211…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 10:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dcbe5ce669b055d1a65629eaeba6808 SHA-1: e27768a168a070459d877aaba7a1c5bbe77ae75b SHA-256: b8c9109698fd321143dcec4c6ca38a90dc2b93b4f01894d198fd48d5f43fcf20
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the URLs and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=linux+programming+guide
    • http://aaaexpressheating.com/userfiles/file/16230089783.pdf
    • https://taevlingar.se/images/pages/file/lejujavatakefolebazaz.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/65952732165.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/mdfrlu6stp54sqjehsg20312fk/vewotufunulijuxix.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a1349535a---3956970381.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609227656659a---donazapiroragasag.pdf
    • http://mytmbc.org/fckimage/file/fevini.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac5b2ab20---61050714439.pdf
    • http://usaoxin.com/userfiles/2021-6/file/tulasutokukizug.pdf
    • https://balajihighfields.in/userfiles/file/30182114679.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/324f2322ec1f910a1a9ba6872d3ea76b/dilotevaberurujozomi.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/0agaui8jsghst03d0f0f325og6/87695931098.pdf
    • http://aggengr.com/uploads/CMS/file/91452366797.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6378b9ea91---16003411404.pdf
    • http://infinity-pro.ru/userfiles/file/40779531291.pdf
    • http://ricarda-allegra.de/userfiles/file/vajane.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/caddf7cd1ece46d3ae8f5d341ecf4239/74958035425.pdf
    • http://primaneighbors.com/userimages/woxusufuduwataxew.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3981ce11aa678de54a8734ec0d154b6f/7123988880.pdf
    • http://primebrokeragetx.com/ckfinder/userfiles/files/fajalebukemiwopalun.pdf
    • http://faradbox.pl/files/file/55025926414.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/coi71dr26kaclgkpm0qt0qmdr5/vuduridebebunenarirex.pdf
    • https://2acontractor.it/images/file/luwimifelumaxawuteko.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6da6703b5e---78947632200.pdf
    • 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_off0000ecc6.bin
070b8e718ac2d45d279f343ade07bf1a96c6d8d5bda3be66caea667fab06d0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 10580 bytes
font_01_sfnt_off0001049d.bin
5d43180b774835bd358662508a06530ae1eec894a947013d0f4b4b99f1f05f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 18016 bytes
font_02_sfnt_off000133f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133F3 16792 bytes