Malicious PDF — malware analysis report

Static analysis result for SHA-256 f61f6b0706abadbf…

MALICIOUS

PDF

86.0 KB Created: 2021-07-15 11:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7988bd4c290a5b087c0e0d3a809dca0 SHA-1: 486f673f38ea230a6b53079376bc901d3b5d6d82 SHA-256: f61f6b0706abadbf557f1edb704ec5ba99f59fc889c0d2ff47a02f46a3aae9a8
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 CMS upload directories or disposable hosting, suggesting a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

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 http://roxburyhs1987.com/clients/63080/File/74450764641.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44e14f796---20781770127.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/de23d782dfcf6fa6667275a89a895dc7/konifod.pdf
    • https://aplusadvance.com/naver_editor/data/file/bifirozavi.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bes231jc22dnlmuhdhpl7ohig6/80213370823.pdf
    • http://chronicles.ae/userfiles/files/reninovonofufupume.pdf
    • http://restorationteleconference.com/clients/73716/File/lokekagixuguxat.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/65b26e1b2b728d4789ce04694be959d6/dilazolomamitux.pdf
    • http://debeleven.net/UserFiles/File/43450479351.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160efd4589e95f---seredanitojorika.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/bc2422ace1906311d302ac20d3872359/nurizem.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/a8q3rd1nafpp3vkeu052nmb0gp/vulasojeme.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f5828c9895116b5c439430fdd93752d8/dufomexenumixog.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7p0i53pgb0nvf0mgj15tspvqr4/koxexejofitalexola.pdf
    • http://lyshiying.com/d/files/76327172864.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/3ce66mf5vh7i1u1md8rntno4k5/34303082223.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eece1e221---7268669233.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c643f96f8d6---73636501993.pdf
    • https://faceless.me/userfiles/files/42251128159.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/90039e115609acb2006f8bc7c8b457e7/xukimaxajosogitaxalifesok.pdf
    • https://mimpishio2bet.com/contents//files/xavivivexewotapuz.pdf
    • https://senfina.top/uploads/files/66402975537.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10ad527eb---winirokaw.pdf
    • http://praguetransfer.com/files/file/rukuvutive.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=free+snapchat+accounts+with+high+scores
    • 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_off0000ec35.bin
74daf1906e519bfdf4a5df2c3615a9006aa325f5c1cef3ba1f537562d7856681
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC35 10768 bytes
font_01_sfnt_off00010505.bin
2eb2a95de3d4d9e3136dc51a187e92fb625e2b85e65fe646a3946d4306fa7bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 16924 bytes
font_02_sfnt_off000130db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130DB 16792 bytes