Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dbcfe4568a28f2c…

MALICIOUS

PDF

74.5 KB Created: 2021-09-08 10:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29404e86cd70aa24f4aeed21ff8b00b3 SHA-1: 54f0d43b95b52d67831d2c95fcb410d4c2f72bb5 SHA-256: 2dbcfe4568a28f2c8946ca0ebc64b02995977fe56c2f623dbfa3bebf1f91034b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cmtsport.com/pliki/32996017593.pdf
    • http://alhouti.com/userfiles/file/judejakafuvufizorotufiwig.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c7176135adb9567fe661951f247ec562/88052819135.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/mexeguxu.pdf
    • https://hotelite.in/userfiles/file/96324703901.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/1siurlpi0lm7828qb4blji24b5/78231910081.pdf
    • https://palet-school.com/files/files/11045402394.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c850ab600c9---gopefalumipif.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d5d9e76ed---fotasimosove.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4d3b4acdf---745063371.pdf
    • https://whiteplacard.com/UserFiles/file/jololugobulawutusixarazuk.pdf
    • http://richfield1960.com/clients/865265/File/38309989239.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/sodojavomimose.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607979a03a192---vawesojogusexita.pdf
    • https://kfmaccounting.com/webroot/img/content/files/jasuka.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd583d529---zoxuvuzika.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/349175d590f026160d33af9c2f01c1b2/30497425267.pdf
    • http://www.moyekolodin.com/files/joturekavizenodufagumi.pdf
    • https://sitycare.com/FCK-UserFiles/files/55890885503.pdf
    • http://digjamaica.com/app/webroot/files/pumowezagagevepupafo.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/43bc0b9d5fcf17d8fae53704fc778b53/27323544432.pdf
    • http://laptopplus.be/app/webroot/files/userfiles/files/kusokajupumuxoxasavo.pdf
    • http://dongphat.net/upload/files/41521686676.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ism+code+2019+pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2df7d62d7751da7943fa5ac53ba7dbaa/nesidanakaxuf.pdf
    • 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_off0000c0db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DB 16792 bytes
font_01_sfnt_off0000d8ed.bin
d2bb66729e918483aca2a5406317c7b080c9655abe80699859adc1da78386d5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 16828 bytes
font_02_sfnt_off00010445.bin
adaf4a73b7153dc1d94a23bab0b2826de7075471df50f7cf2fa6f155a9b482ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10445 10592 bytes