Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa327b829c0392c…

MALICIOUS

PDF

90.2 KB Created: 2021-07-22 17:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a6ce03c5c6b2739a64ba248f54a00c7 SHA-1: d54284458b73c5a8103b2d4c97d5c13559ce6a41 SHA-256: 6aa327b829c0392cfbb30f516831aab44e6093c42cc6b150e9bea7f8b423f6ae
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories. These links are likely intended to lure users to malicious sites or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608498ba04baa---60810780743.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a9b2b3a56df2c79f3517a3f95cd55f44/40822694123.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160756f151e172---renemo.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/a5tjtjcnts46heeqne3596lbqr/71984156012.pdf
    • http://yanartextil.com/firma/files/67225116107.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ao2sf31fa2i36laj5gfd9s1dio/3628596088.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1de68effc5---18087233685.pdf
    • https://jmcoverseaspvtltd.com/uploads/files/67690308829.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160921d7a573cc---21207531084.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aa164dc19b9676f47384fdb21c9ca21b/lofonuzosewewuv.pdf
    • https://tramhuonghanoi.vn/upload/files/20277332158.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/08874c877a6e1ef42853538cdd7fb4b5/67722408348.pdf
    • http://consulcongress.it/uploads/assets/file/78831826278.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098377af1321---85643765670.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/535b83315e41e45df749a90652aacd0f/22171643874.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608528b9f1955---xojafexuragolin.pdf
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wuvaf.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/akpk4t1vaj6m7t891nhrlqhbf0/61773666224.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/989ce0da3819e7fd4d1e55f21028684e/besuzamojipejupebivefe.pdf
    • http://aimic.com/userfiles/file/69867431268.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842da28a34---wijaxafetixisokolexu.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8601735e4---89100882445.pdf
    • http://midel.me/userfiles/file/rojavivuk.pdf
    • https://mariellatriolo.it/public/file/dudofupofigixu.pdf
    • http://smflow.in/admin/uploads/file/gunajuwijefopifomedinev.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160edabe65a159---piminifetejunonegufumasi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=excel+vba+transfer+data+from+one+sheet+to+another
    • 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_off0000fc35.bin
580753dca37a0efb0e02f55949f9b39ae43af713173f07f658538a2c991bbb35
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 16908 bytes
font_01_sfnt_off00012887.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12887 16792 bytes
font_02_sfnt_off0001409e.bin
30ef82566934dbd6ab0ed6a5114d8717967db3745c3e0d66a4cc5286aeab0340
pdf-font-stream PDF embedded font (sfnt) at offset 0x1409E 10940 bytes