Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72bfa0d13c098f5…

MALICIOUS

PDF

99.2 KB Created: 2021-07-31 18:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 62b6b209a7e7968d2fe0e783553c754c SHA-1: e8add2c349d53cff4a053efdf1934ca6a42f60cf SHA-256: a72bfa0d13c098f5f1d5ae09fb064591f368aa1ae1112f8ab2f1c497b4d70bd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://aliceinformaticasrl.com/user/pages/sifotiwol.pdf In PDF document text
    • https://dermatologie-francophone.com/userfiles/file/toruworuloxowowor.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/aa70c7d8097dd75d34990e5ec5d62728/dejilej.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/sexaxim.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc6f9512da---73469968637.pdfIn PDF document text
    • http://mp-journal.com/media/file/rifiwidokibopanokepebinax.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6e802cfa9e81f8eac5246adacbe473bd/1146386428.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/bfb905d3d5773c1bbbda81ccd79afb60/woteze.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/13669948103.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073a60ea0625---17333871153.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/g4lf2unl7pntm1c4dusfpsn3hs/60165174587.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/47601669190.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/998t61nrrml7to5vhsvtomfnc4/84791011125.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/xadanezevaj.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c46efaec---66138933131.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24ec5ec9b1---zobavi.pdfIn PDF document text
    • http://wernitznigg.at/files/16157507957.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/lurovodujuze.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/gekebutezorimekafe.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa553ea9756---xidijafolamefojaxadupalu.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/puxekoxikazisugufovuxi.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/63475303856.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/82443f49b928591a4d9f625de12b6805/754924071.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/wawof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ncert+exemplar+solutions+class+8+maths+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 11272 bytes
SHA-256: fa165a206e52d8e0bdc76b96606f8f77008ca29b2ecc8345f16b35ba7bc50ea4
font_01_sfnt_off0001234e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234E 16224 bytes
SHA-256: da79484a7f94e028a8871d907a282bdc2df095dfef79f7b1f2af1efeeab75da7
font_02_sfnt_off000138f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15105 17456 bytes
SHA-256: ae99a4e1aae3f81e11f125939630efd3834874a215de26f0e6097013df1165d3

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