Malicious PDF — malware analysis report

Static analysis result for SHA-256 849f5fa1d140b4c6…

MALICIOUS

PDF

70.1 KB Created: 2021-10-03 21:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a815746ffeb418925a9e88d761663f2 SHA-1: 9044d5dde484b50ff01b16a1430b069ded804d7f SHA-256: 849f5fa1d140b4c600ed3b7530acfd68cbfd323899a6a62e4071223df97ae8a5
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ivankotov.ru/img/lib/file/98846054548.pdf
    • http://www.ags-sib.ru/ckfinder/userfiles/files/dijifefekarizu.pdf
    • http://legalinet.eu/userfiles/files/mawefimuja.pdf
    • http://infrabud.eu/fckpliki/file/kuxovu.pdf
    • http://munnarinfo.in/userfiles/file/naxunefurepimaxazenujo.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/74470505772.pdf
    • http://alphasigmaoverseas.com/userfiles/file/71071941469.pdf
    • https://sabagdasarov.ru/upload/file/zajaloxupatowosob.pdf
    • http://www.deep2001.com/images/library/File/56830374316.pdf
    • http://batterseataxi.com/survey/userfiles/files/gulavurotejapex.pdf
    • http://industrialsupplies.pk/userfiles/files/56548333481.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c55003122b---11211826653.pdf
    • http://aelma.com/sites/default/userfiles/file/dikirakapob.pdf
    • http://bjsddesign.com/filespath/files/20211003022501.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/72872088073.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156cff24b979---mefinatifumet.pdf
    • http://lustigersteirer.at/userfiles/file/xejukofirepimin.pdf
    • http://blgjad.com/upload/files/logotezuzofegojemotiden.pdf
    • https://gulamanis.com/contents/files/zuleroboronesutixusepa.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kdee9tumeksogcab7fdd8k9sj6/gunudop.pdf
    • http://belgium-ex.com/images/blog/file/wigoxidanekelu.pdf
    • http://hb-hospital.com/file_upload/fck_upfile/file/98450165178.pdf
    • https://408of53crownstreet.com/assets/media/files/fawovoxibotapevole.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=security+career+objective
    • 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_off0000afcf.bin
8f42f4e48eca21c6e25c97ef828cdb335a6af906b7d8dd8e29a25c3cb0186622		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCF 10528 bytes
font_01_sfnt_off0000c7fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7FA 16792 bytes
font_02_sfnt_off0000e00c.bin
6545279511f7fbe652cc33323e079291537a61f646cb81508770790d050ec7c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 16828 bytes

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