Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40f88dbe7b7f91c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-09 17:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86fee01d604064dc09593867c0199a15 SHA-1: ba88833bd057631b347dd122c977cce0a8d7494f SHA-256: b40f88dbe7b7f91c1bce33ce38b84825c3639e936ccd7f4bf66dd6df9e1fa887
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://crysiq.ru/uplcv?utm_term=elite+federal+assault+ship
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tumodibupolitezegovekikol.pdf
    • http://bobiniauto.com/userfiles/file/43346616468.pdf
    • http://waetsukai.jp/system/ckfinder/userfiles/files/89718906332.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/waxezitogofik.pdf
    • http://ninda.vn/userfiles/files/garipira.pdf
    • https://www.asoriofrio.org/ckfinder/userfiles/files/31974661528.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/44477160000.pdf
    • http://jungam21.com/upfiles/file/1630489487.pdf
    • https://desco.scp.hr/files/xizufutujogu.pdf
    • http://aerotherminsulation.com/userfiles/file/silurowevumowuxutot.pdf
    • https://santa.sg/images/users/00000000/files/56278422324.pdf
    • http://finara-v.com/file_media/file_image/file/14945670848.pdf
    • https://cokhivietuc.com/img-vietuc/files/nusixegekulinosozinavamo.pdf
    • https://digireg.ru/upload/zevira.pdf
    • http://hmsendo.pl/uploads/editor/file/38208608864.pdf
    • http://caythuocnam.org/images/files/raxipumumojop.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161315adadb345---46028001329.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6ba749835---63483770292.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/kejobexibagokodepuger.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/baxos.pdf
    • https://protectname.xyz/whoisprivacy/userfiles/files/97076215356.pdf
    • http://www.hgbehringer.de/img/files/files/67583168548.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/fasabezazagozovulebarolir.pdf
    • http://sushimura1.com/uploads/files/bibujozalezedago.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/19595650464.pdf
    • https://2b3la571ga-70p.com/contents/files/rabavefaw.pdf
    • http://gianenricofabro.com/userfiles/files/jeguzodukedepanumijasuzi.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_off0000bf78.bin
ae591f64ac32c3f247464e2e124e48c04c28836c6d8dd99da84cacc01710d499
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF78 17992 bytes
font_01_sfnt_off0000ee94.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16792 bytes
font_02_sfnt_off000106ab.bin
8159a0af24b441ec66a63c31c4b2b7704268a42eca549bb35ab2d9951fc3dfe6
pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 10452 bytes