Malicious PDF — malware analysis report

Static analysis result for SHA-256 71940473397bb7e0…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 00:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e70bb559a5606b719614eabc36d1a60 SHA-1: ee9da57f207a5d5f470df5f347215fdef3b2670c SHA-256: 71940473397bb7e0758fd98522663450821db6e1bb67e2b821ccbf56a455eb7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external domains, many of which are hosted on disposable or potentially compromised CMS upload storage, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://dzbnf.com/upload/file///lenamabu.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715bf55eb9b---pezitojodov.pdf
    • https://asfus.net/virgsurv/userfiles/file/89774662267.pdf
    • https://lecachet.fr/docs/files/rugevekapewibasa.pdf
    • https://atputasbaze.lv/images/userfiles/files/59232541484.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf021dee88d---zijajatedebosomaberow.pdf
    • https://bititechnika.com/uploads/file/19213246899.pdf
    • http://albino-pitti.com/pub_img/file/35023122014.pdf
    • http://littlepearlspublishing.in/data/eimages/file/42781452728.pdf
    • http://31kouqiang.com/userfiles/file/1623104499.pdf
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/59434170066.pdf
    • https://dolcezzecaffe.it/file/velipuguvaramexadamupojo.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5e7d0d810b73baca34182757c07d2506/20731864595.pdf
    • http://bitree.net/ckfinder/userfiles/files/25656570995.pdf
    • http://duda-tech.pl/dudatech/upload/file/46801009327.pdf
    • http://files.ibiza-ferien.de/file/tavemuvozowuzozanepagaxuk.pdf
    • http://thuduchouse.vn/pics/file/ledememaxanesapexitor.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a156405c66f---kepikikasamizesel.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97dd337fa2---wesozezekolakekowili.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/kthrv0fg7g4noea2m7jut7csg7/sagokirisiruredere.pdf
    • https://manenshop.com/upload/files/26909738709.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/ueivtesrvt6oomhrluqna10i2f/xavetapipaderetubufisagu.pdf
    • http://health-bridge.in/upload/file/dudadodu.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///butafijojaduvamosovo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vocabulary+practice+worksheets+5th+grade
    • 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_off0000c6d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 16792 bytes
font_01_sfnt_off0000dee8.bin
dfba55cead135278929b800d59977860c46bd0cc2e2c7b34cc851dbe769ae5d0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 17528 bytes
font_02_sfnt_off00010bfc.bin
7ee9f9e9a415c805ca7acf17122d29a72a017e83e39bba5e2f3d9c76532e68ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 11324 bytes