Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf21da18cd7ed96…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 23:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b005ac296066b3f1edd3a25b3a0a232 SHA-1: bfdaacea8c76c5570126fbcd015b5fef71c7858b SHA-256: caf21da18cd7ed96c4f7b9fceb005c78e793213955b457a66b9c8ff180d6eab1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5296

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=filmorago+free+download+for+pc
    • https://melnikhouse.com/userfiles/file/kudududibazupog.pdf
    • https://nslogisticservice.com/userfiles/files/bunepuxitogabazadikonux.pdf
    • https://foodexgida.com/uploads/files/perepiletijubebetuker.pdf
    • https://coevent.ru/upload/files/jumon.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/49647496469.pdf
    • http://alda.pl/ckfinder/userfiles/files/xoxutokomes.pdf
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/14200220289.pdf
    • http://rafaelstore.ru/upload/files/moxisetexelajid.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbdec85ad---11697962332.pdf
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/ximalepazazazuso.pdf
    • https://el-tall.pl/pics/file/59390444631.pdf
    • http://spellenindex.nl/images/uploads/83621031787.pdf
    • https://www.khaosanpools.org/ckfinder/userfiles/files/80472761080.pdf
    • https://thebottombillion.com/business_school/uploads/file/tevagopoxirufovotut.pdf
    • https://subded.org/userfiles/file/79829527290.pdf
    • http://bdsps.org/slbdavbatala/userfiles/file/56120030334.pdf
    • https://et-auditing.com/userfiles/files/21653384666.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143bd67c074d---14204655764.pdf
    • https://panificioilcavaliere.it/userfiles/files/93645921072.pdf
    • http://telegid.tv/userfiles/file/27267999470.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/34685652591.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16131c592ef0db---98876158266.pdf
    • https://braus.uz/images/shared/file/kewejoxojukozefununefoko.pdf
    • http://elezioni2014.gds.it/userfiles/file/lozomoluzi.pdf
    • 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_off0000d771.bin
4a6e698495bb517ef249fe06561f1f30fb84c960328d9ea3008ba5ea31e7ece4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 17628 bytes
font_01_sfnt_off00010488.bin
f36ab841a87723a5e3580a4dccc0b473203afa83d6c33b5fec7d9e8abddaa766
pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 10760 bytes
font_02_sfnt_off00011d06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D06 16792 bytes