Malicious PDF — malware analysis report

Static analysis result for SHA-256 320e2556b955d9f8…

MALICIOUS

PDF

82.3 KB Created: 2021-09-24 12:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1cfa8628f5d37a839fa45554bc12106 SHA-1: 1a91113885e26fab3dc31b0e0d5cd925db167666 SHA-256: 320e2556b955d9f834b76f75c963d647ff170a1935c2e0bdca8b7cf1cccc4c1a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various compromised websites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The presence of embedded URLs and the callback lure heuristic indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://wastran.ru/uplcv?utm_term=vidmate+for+iphone+6+plus+free+download
    • http://asesorgubernamental.com/images/file/96464754523.pdf
    • http://h04ydivan.ru/userfiles/file/66342970178.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352a62449ef---95895637169.pdf
    • https://kvzriu.org/images/file/pebazutalogorat.pdf
    • http://stonepigments.com/userfiles/file/48235127432.pdf
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/piwamadirufijajofog.pdf
    • http://cesurmakina.com/userfiles/file/29327278075.pdf
    • https://korvioinfotech.com/ckfinder/userfiles/files/fojapisoroforeresateni.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/15lki5os4ue7a34cji1cvpjuh2/povuzuxoguzibilir.pdf
    • http://vinmexindia.com/uploads/99997622393.pdf
    • http://qianxi.cn/filespath/files/20210901211002.pdf
    • http://lexxyin.net/files/fckeditor/file/42821215345.pdf
    • https://abisspaandboutique.com/nbloom/fckuploads/file/rezesabobekadix.pdf
    • http://greenglobepms.com/uploads/9127325596.pdf
    • https://unique-u.biz/images/uploads/file/95929339729.pdf
    • http://vetranhtuong.info/luutru/files/kesifudusesivog.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/53757581357.pdf
    • https://pasarantogel2.com/contents/files/47656957140.pdf
    • https://mimzyonline.com/userfiles/file/49926461111.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319748cff92---64733433331.pdf
    • http://gfb.it/upload/fck/file/xulelabikunexezi.pdf
    • http://clairvoyantinfotech.com/demo/images/43928703084.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/24021777662.pdf
    • http://iknow.pl/files/file/97963711027.pdf
    • http://nuovojob.com/userfiles/files/9229983010.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_off0000da68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 16792 bytes
font_01_sfnt_off0000f27a.bin
74fea5920385e0d98d08ecf29078318b940209385ea2386ab2400758a4edfdf3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 18280 bytes
font_02_sfnt_off00012191.bin
bda0de65b8649461da41e0de1e833b827ee0a984a33f8dfdc54b2110af04c41b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 11088 bytes