Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da24a2ea5841f5e…

MALICIOUS

PDF

93.0 KB Created: 2021-06-26 13:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 503473037afb49b322e5cf1c022707da SHA-1: b397388e2662e8d158d474a6e70e400e9e628947 SHA-256: 1da24a2ea5841f5e5f7577209e78e85acfc960b23fb764a84a5c5f31ae8cafd0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084191584fca---tedek.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8406ecafe3---19131292253.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/4b875437bd3054322f7a2666c8ec5f3b/57887740803.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab5fa0bcd---79096574588.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4123e2d6a0---mijaturazemafebesuvude.pdf
    • https://vanphongphampmc.com/upload/files/wizipurabemeba.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4429d8fbe82e13eabdf6320a3efc967f/widanopux.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82154586f---detuvikapojuzibelodezor.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ce140659---38101140366.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e659c4e2f2f8c5b7584d040f97d817c0/pebalinife.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/6qe4crrneua74fdldunthphk9g/luteseli.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6b0bcb55fdf83a473696da93684e8bd8/feranewisax.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cb471c858---luvifefetow.pdf
    • https://alnahamgroup.com/userfiles/file/44148972751.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0d2fb09785c9810937db3469efd7ea1f/zijesojipi.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/69013906016e51c246b54892c5743692/39917580002.pdf
    • http://saga.diamonds/uploads/ckfinder/files/tajuxexavuv.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/d08s53lbhiinf934cfqotc77gm/55692498852.pdf
    • http://nw-line.ru/generic/uploaded/vawegexemipopilepokol.pdf
    • http://hrudolf.com/userfiles/texuvagedevubaruveni.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fefa9d7e3---98602635362.pdf
    • https://detmers-kontejner.hr/files/86386375309.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/grugisdlkrem60js1nsp6sn34b/97835913597.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pko9fho2giiatnasanfcpuvjnh/88461354983.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2d811de310c35e53196eed67d8bee898/tapagamuximobimataxujetu.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/30ba26964aef90e518382d16c7a465b0/fixovilirimakuxapokenese.pdf
    • http://group-anons.ru/userfiles/files/11387044021.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=driver+booster+7.1+pro+serial+key
    • 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_off000106ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 16792 bytes
font_01_sfnt_off00011ec3.bin
650ad2a226d228989cd6777e2c6182daabc822a9b97e6cba6745ed654d1d844d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 10720 bytes
font_02_sfnt_off00013777.bin
73481c4faa12fb8d202ee8a004f97ce5ee19340e22a85d6ce4ca20bf79e8f921
pdf-font-stream PDF embedded font (sfnt) at offset 0x13777 18040 bytes