Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb3dbc452306f57…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 06:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd37dc339e6281815ee821a9d6a29249 SHA-1: abb991dd62bd409d50e6a204483a3a0193e31f6c SHA-256: dbb3dbc452306f578a351cda2691189fcfa36e8e8c71739eeb3fa47861e1b289
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://olsztyntransportmedyczny.pl/userfiles/file/vumunonuren.pdf
    • http://sochisushi.nl/survey/userfiles/files/taruxotatubojem.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a0d87bb6---bigod.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/416429f9ec8800d2f9fba83b565738e9/61752490796.pdf
    • https://dolaodong.com/userfiles/file/ronijujidexafarowar.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/996013dc4ca1053ada4df0b00c7a65f5/42992120508.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0a0031b73---29950248706.pdf
    • http://moyamoya.center/images/hand_uploaded/files/zawibaginasu.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4303a0c7e5162852f83c60351b6fdb98/gudipevipunawebitev.pdf
    • http://z-i-f.ru/userfiles/file/notiludanakeki.pdf
    • http://ahxxzx.com/userfiles/202105/file/29092416778.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c4066328e---luxulularisizapewuz.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/49706d74c3816be9c7a2533dc46c1413/radofupesaminunazud.pdf
    • https://flyags.com/editorResources/file///gupenuzedepozaxofel.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/g2nq5e49c7baak9lurmo0e9t65/82958293812.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/hj1a56b03l9pqkkqjisoaimljq/78015261537.pdf
    • https://burkina-businessschool.com/business_school/uploads/file/72935612583.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/38g7cm7qjm43sfmhkct03subi3/mejadowesaxabute.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6ckodg68b2argnb3o5qj4u9agf84g0qe/xaxujipoxapibipuj.pdf
    • https://stdtekstil.com/upload/ckfinder/files/81254715537.pdf
    • http://www.nomorcantikjoss.com/file/27310395384.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zuzuwowalegobaxazaf.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/970aa91213ef1df05f6812b8207266c6/33271665807.pdf
    • http://31kouqiang.com/userfiles/file/1622646973.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=graphic+branding+and+identity
    • 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_off0000ff2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 16792 bytes
font_01_sfnt_off00011741.bin
5e2286ce4b77820b2e3de42b667125a2ec46f2b6c219e2c6d5004061c614ba6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 17728 bytes
font_02_sfnt_off00014578.bin
4ce6b3a04dbceb8f0b3b4926e0846accd2721bd85922208b1bb4af61fddf2798
pdf-font-stream PDF embedded font (sfnt) at offset 0x14578 10752 bytes