Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd67a67532edff4b…

MALICIOUS

PDF

87.7 KB Created: 2021-07-17 11:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f95cce1d2322a2e52250a257d7be24ce SHA-1: a84fc27dbb0b409ee2e70e40556dc5a419b71178 SHA-256: dd67a67532edff4bfddef0b211e172f44fb5c3f92afa9da8a77017c5766e553a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download lucky patcher apk' URL in the feedproxy link further indicates a lure for potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ed-web.cz/userfilesfile/53116916827.pdf
    • http://jkbprivateiti.com/userfiles/file/jodupumepokop.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d630b4e455---tefutejenixivoroniwo.pdf
    • http://acpiindia.com/userfiles/file/75507924861.pdf
    • http://georgekoldun.com/var/upload/file/zajawa.pdf
    • http://yule-sign.com/upload/editor/file/20210603082227.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/96vac3ob2o9155ct305ci6ibg5/jarerigadapejesokujo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c855f25a787---kevoduranabopolasi.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8f9352adea5d0a7b26cd7ac52e2f639e/5380155668.pdf
    • https://communeouchamps.fr/userfiles/file/fadubufixelavisubizabakuj.pdf
    • http://rapabzenec.cz/obrazky/files/25603510796.pdf
    • http://masan315.net/board/imagefile/file/livegebege.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d451765aa---74351935897.pdf
    • https://langumeistras.lt/i/File/23178000194.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec02f11a4---filexobuno.pdf
    • http://brainbond.ro/userfiles/file/rinetaruluxebesel.pdf
    • http://wahluenfty.com/userfiles/67659693161.pdf
    • http://bright-mineral.com/uploadfile/file/2021061904462392.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dcec3a108---4412903698.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dd840e4bcfe---83163709482.pdf
    • http://cc-loges.com/uploads/file/vuduwoxo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+lucky+patcher+apk
    • 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_off0000f0ba.bin
5defff3b4157b75019eff02a7f6fe00fe1f44f280ba781fdcec93d6cf57db4f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BA 10744 bytes
font_01_sfnt_off0001097c.bin
a62b9030a23ad0d109b8650e986b5872601f114c73ff04dfbba844da2bbc68c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1097C 18184 bytes
font_02_sfnt_off00013800.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13800 16792 bytes