Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ebae0af90ba35e7…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 22:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9272e73abab99040a5c9a85d07c8257d SHA-1: 13a4880619ab6c93d8c56842a694a442a9733d46 SHA-256: 6ebae0af90ba35e7da33d3620bfc9807efaee939fa8c2fb9947871717b992a4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to these compromised sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607887ebebfae---vasagobejaban.pdf
    • http://leguido.net/files/rukelawoveliramijimosax.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fb6abc1cd8d56e6680d368a75499ca67/xenimevudolukiseguriziwi.pdf
    • http://al-bandak.com/userfiles/file/2880586108.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608440230c9e2---56666736645.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/u2cg96tkmv0e4kg8ovaudeofm1/perumoripodo.pdf
    • http://al-bandak.com/userfiles/file/83877367953.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa78c84691---gowujaxesenedisenarososu.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ndkstb9dvgmvmdbngdrlr1k7kq/21076492236.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/26607990286.pdf
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/jejixojofepasunon.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/70258926346.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/98f4bf7a11722d26bd06271b207a123a/pugekejalat.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/mjtct83q2a0aut44phutjutsk5/vebisavokebi.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad192fdf6f3---68016665323.pdf
    • http://www.asslar.de/downloads/75856614320.pdf
    • https://prosaison.fr/userfiles/files/48308952513.pdf
    • https://mimpishiosatu.com/contents//files/55235218365.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ec2e6b82---83259378546.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/802sktq932hrhdqk3tmu23chi5/dabofil.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/71424720850.pdf
    • http://gyobel.it/public/file/wusovi.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/86e9e93e359f7c3398e2be8ba65cbced/36371021453.pdf
    • http://www.abcklima.hu//data/editorfile/pinupexavebomabenadi.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/dd196e525d5c261fa73984a9243a0ee0/87326370000.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=metabolic+acidosis+in+preterm+infants
    • 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_off0000ef24.bin
25997d1e5d7705a0f11d24a15b14f1d4353c5e46c1e2464bcedd93e28693a43c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 10916 bytes
font_01_sfnt_off0001082a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1082A 16792 bytes
font_02_sfnt_off0001203c.bin
218b5d792567233cefe07f0f08ba441efb1811fd4fe7a14d1b59201767d74b74
pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 17212 bytes