Malicious PDF — malware analysis report

Static analysis result for SHA-256 5517c057ec1dc3aa…

MALICIOUS

PDF

69.6 KB Created: 2021-09-30 18:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1c8975f245b30fac28fac3212267b2f SHA-1: aae9c10aa8ecdeb6cd9fe0ed04f84b0f07322d24 SHA-256: 5517c057ec1dc3aabd6b83614835756d64e16a06e9feaf2dc1786455a39dd82b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites or download pages, such as one offering 'grand theft auto v premium online edition free download'. The PDF structure and embedded URLs suggest it is used as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=grand+theft+auto+v+premium+online+edition+free+download
    • http://ajk-opakowania.eu/upload/fck/file/loparazupisi.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/dfaf1c8d961d04ab95e0ee84577718ca/71193372266.pdf
    • https://charlesstreetvideo.com/userfiles/file/30920977116.pdf
    • https://birudongker.com/contents/files/77414910980.pdf
    • http://vetcasatenovo.it/userfiles/files/57754266707.pdf
    • http://proleague.dk/userfiles/file/49360115636.pdf
    • https://rusepress.com/uploads/wysiwyg/files/98560408935.pdf
    • https://markaoyun.com/calisma2/files/uploads/53685349128.pdf
    • http://esipro.fr/userfiles/file/35486885083.pdf
    • http://an-ocn.ru/ckfinder/userfiles/files/96722186996.pdf
    • http://erex.hu/upload/file/gaketofezurunazupadego.pdf
    • https://bruceautoservice.com/files/file/41755034504.pdf
    • http://fc-junajted.com/upload/datoteke/34709941051.pdf
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/nemaneza.pdf
    • https://abisspaandboutique.com/nbloom/fckuploads/file/35875751912.pdf
    • https://vinadesigndanang.vn/uploads/image/files/13826532151.pdf
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210924040208.pdf
    • http://canadanur.com/resimler/files/gawufowinigedexamow.pdf
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/xejuwivujevifo.pdf
    • https://nbc.com.vn/ckfinder/userfiles/files/11409378876.pdf
    • http://www.ufolep-69.com/contenus/files/2617217310.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/6c181361c8307435c639e65e4e1e09fc/20880502011.pdf
    • http://nousgarage.com/userfiles/file/fawetuziji.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/kk4khgbbnimrnsu3lhdub4ks8f/fivarasusipituzo.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_off0000b0b6.bin
57dd157aee55401799148e34ce2028fff88d9ccc7cb01b550c307202caba2b63
pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 15216 bytes
font_01_sfnt_off0000d70f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 16792 bytes
font_02_sfnt_off0000ef26.bin
db757256d7f3cb9338a54815dfc465992ae59691b305e74a27056bbb8b801adc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 10884 bytes