Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e6d17cb26d3439…

MALICIOUS

PDF

89.4 KB Created: 2021-07-15 22:38:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 310978b81671944ff15f63e16c0752df SHA-1: 9a1aae4d670e9e75da8dde881eb9b2133b248a25 SHA-256: 62e6d17cb26d34392c3d57bfaba539538fed339a5ff5b519a87536f0cd567967
156 Risk Score

Malware Insights

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

The PDF contains a link farm, with many URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and a high number of links suggests an attempt to obscure the true destination or leverage compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764b724d3fb---bekiwezelate.pdf
    • http://au-coeur-du-temps.com/userfiles/file/7010987532.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cd487635b---domusowafaxexexudemo.pdf
    • http://dagmare.de/userfiles/file/perinajavasazo.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/fomiji.pdf
    • https://lawyerupsmart.com/tempimg/file/rimobafupitolu.pdf
    • http://gchsclassof1970reunion.com/clients/6/6a/6a45fbe13d63dbb0eb8070d7cb9dbc89/File/82226417695.pdf
    • https://baigiangtoanhoc.com/upload/files/59698137479.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607173f597d4a---51213703062.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1818c37c0---vedavuruletafozi.pdf
    • http://bulongvungtau.com/media/ftp/file/3150136187.pdf
    • https://minipowerpack.net/upload/files/sasepapevawunujo.pdf
    • https://tonwen.org/userfiles/file/jifujolesagixig.pdf
    • https://tungqibiotech.com/upfiles/editor/files/bururivisudotakubesetovaz.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94927557ea---sujusunozapaxinunax.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ib6fchtnhdfg4m1v3pvtktp885/53897599824.pdf
    • http://tutek.eu/userfiles/file/14832662679.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9997eb125---tisiponi.pdf
    • http://adveotec.com/img/file/81309419508.pdf
    • https://bcbc3399.com/upload/files/12984081677.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3caf9c690a---rijelefetojefiwamara.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/59112b37980cab599831a7db86e76bf9/16667882400.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6a5d5a54---23593846341.pdf
    • https://anandamsanyal.com/userfiles/file/vejodikajejukuvu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=b612+apk+without+watermark
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f281.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF281 16792 bytes
font_01_sfnt_off00010a8e.bin
28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 1696 bytes
font_02_sfnt_off0001129a.bin
21df5a0f03bc0f4e68db27791b58922a0b992e1a42f0d18c44d3ddf1f8c9a734
pdf-font-stream PDF embedded font (sfnt) at offset 0x1129A 16948 bytes
font_03_sfnt_off00013e92.bin
a3baa480cf3a3df71649ab0b6e5f35af48eca07027c7cbc488748acae3b8af85
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E92 10872 bytes