Malicious PDF — malware analysis report

Static analysis result for SHA-256 f136c68c315e1b97…

MALICIOUS

PDF

82.6 KB Created: 2021-09-24 06:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc195e676cc4856db1085edda8ddf5de SHA-1: 7132b83ee6b44e9a2ec7bc0e8f187dfa26366d38 SHA-256: f136c68c315e1b97e343b04a77ce5fd2ff9fcdd33eab83f58c5adfba0937d380
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF suggest an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://huntic.ru/uplcv?utm_term=2020+top+android+games
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136488ce8908---tijepopawufu.pdf
    • http://svenskafik.se/uploads/fckeditor/file/28198297673.pdf
    • http://madmojo.com/fckupload/file/pojagenoperof.pdf
    • http://www.urbanwaterways.info/files/29874047899.pdf
    • https://beeshark.ro/app/webroot/files/userfiles/files/65522754734.pdf
    • https://candbco.com/ckfinder/userfiles/files/romaxitunadalasofifidapi.pdf
    • http://www.como-grup.ro/fisiere/file/kemowaverupewimuvijejefuz.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0631b790150883b107b4a5d7b5f247a0/fesadowidokulovagozap.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/7ca4949cf594f5fbc19cf24863e83f78/38770534930.pdf
    • http://playeasypiano.com/resources/fck_images/82629319196.pdf
    • http://nage-z.com/ckfinder/userfiles/files/tarug.pdf
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/topogijikebexozapazo.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/puwokivalibalaneku.pdf
    • http://diadiemvui.com/upload/files/14375670142.pdf
    • http://balcimimarlik.com/resimler/files/jorezirotis.pdf
    • http://giovanninociti.com/userfiles/files/sojoge.pdf
    • http://ktai.lmg.jp/upload/file/zalon.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5b44a985d1b8d1d4661ab74dfdf68927/59807869132.pdf
    • http://geometrabottero.it/userfiles/files/jiponimevekax.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/32a60d6c08db860960e28755470673cd/valiresif.pdf
    • http://sziszolg.hu/editor_up/23142859175.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_off0000de47.bin
36613f51aabd79c3d33313eb7595c095931e70446e75dc838a805da4efa0dee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 17640 bytes
font_01_sfnt_off00010c23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 16792 bytes
font_02_sfnt_off0001243a.bin
3edb2737ddf70cf066e3e0a530aafc754203ba644ddd993d37a153b080586d79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1243A 10836 bytes

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