Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef923a2ceef460c9…

MALICIOUS

PDF

80.9 KB Created: 2021-09-14 01:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4bd78c52f4877d432ffb38a1423b14c8 SHA-1: 2dec7508f82fa3a0538c293d34b2841cf33ecb80 SHA-256: ef923a2ceef460c9e3ac87f901346df626bacf8785b11550f0b325f95fa9956a
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://crewmak.ru/uplcv?utm_term=truecaller+latest+version+apk PDF link annotation
    • http://studiosantomauro.it/userfiles/files/gusameligizijudagijujofol.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/togubivifuzozilogi.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210908155347479.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/4008192500.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/41694877144.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/bimalalerarogutureter.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e3b2f277---8996123455.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/37826519927.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/80127224286.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/65676423132.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c7d25dd3---61600598389.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/42940115143.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/xuboreluvimexorebujeworez.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/jemegitaleradilasaruvu.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/felexowigujiretebo.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/79109432017.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/pezidugubagemosovan.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315e40d90af---nifofotinebigafosevafeg.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/tijolonagamo.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/83794447223.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/kalujutubojaribaxorobukov.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d69b4ceb1---23322917787.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/66414269188.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/tujozitagop.pdfIn PDF document text
    • http://max-metal.pl/gfx/file/sujitagapazi.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/luzogamuzaduxusabezalet.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/vuxeputowatezuzova.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/44461286204.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1F 18440 bytes
SHA-256: e64f45f4873ddb2e370d1bc113fa0e5ef461b81f87786f943dc585f452c0a2a3
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 10588 bytes
SHA-256: f561fad33ca362437e391576863e06076511f56e4fd7f866fef722481501d34c

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