Malicious PDF — malware analysis report

Static analysis result for SHA-256 486ab6ed66524220…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 09:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e634318a45400c075809a1b38e4030b3 SHA-1: d69e97f814d441a9d26175160452d7d0eb4a978d SHA-256: 486ab6ed6652422022fee31b22c406c764a6d652e1ebe5157883c6a045200f68
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://drafthe.ru/uplcv?utm_term=what+are+the+two+methods+of+acquiring+human+knowledge
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/fixegogiwek.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c699b6a9e57---52169564244.pdf
    • https://noithatkuongthinh.com/uploads/files/38480161435.pdf
    • http://security-m.jp/tool/images/file/wasiranuwo.pdf
    • http://atol-res.pl/uploads/file/gaxupafajig.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091ab474aba3---buxipoka.pdf
    • http://kiemtoanhaiphong.vn/upload/files/mefeni.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d9e69a943---dekesejeravafatagixelol.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/pak3dj67q3m8rhtlu3o5g2ha8f/zuguja.pdf
    • http://silverk.ru/img/lib/file/73080375565.pdf
    • https://ms01bet.com/contents//files/zilej.pdf
    • https://edbcagliari.it/file/jekizavilubivubewaxa.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f98a22f990---zojusililu.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/4fd8e533d5f3cf54505d8e6eb881b245/567571010.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869f557a2d0---redir.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c02abc745271658e443b3a9a10f42947/jagubepub.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60a1240040---kugisu.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ijteatjaaou0l3grknfptmu6o1/wexuvamemowifad.pdf
    • https://oilbasaro.com/web/images/ckfinder/files/20210623083118.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/f8371cb9f39c3bfd3155fbbdd9edfb52/86179048914.pdf
    • http://alconsprom.ru/ckfinder/userfiles/files/56119839569.pdf
    • https://nhachoxebus.com/upload/fck/file/57540925632.pdf
    • https://aashianarealty.com/file/58396181701.pdf
    • http://cdmvt.cz/sites/default/files/mitumibado.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93d350c78a---42215857673.pdf
    • https://beauti-full.ru/uploads/files/86615103977.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_off0000f854.bin
747e8ac7dc6ca09b240386404df9e5c5d7b95a3181f2d01c7483dd139cf950e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 17320 bytes
font_01_sfnt_off000124fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 16792 bytes
font_02_sfnt_off00013d12.bin
9e928809926f2bce3c255ce9a753e1671c8bde850bd428eccf47f080d8d37b48
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 11340 bytes