Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bf04873dfa7299…

MALICIOUS

PDF

67.1 KB Created: 2021-08-23 12:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d00acbeb5a6ebd204c040d264796207 SHA-1: 5b71c7f53d864af64d674b74daa8f7e4c9dcc45c SHA-256: 44bf04873dfa7299c24c2909892cf824d8a45af5361cefe00e40eb362972239f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8521

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://driscollandgibson.com/images/edit_images/file/28978381338.pdf In PDF document text
    • http://hermandadperdon.es/userfiles/file/58087113411.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c798656b2---27021945562.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021081012531973499.pdfIn PDF document text
    • http://ore-processing.ru/d/files/zabobinatezed.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/33269997459.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/leg41gq399ric3jcbjirnbcene/zojedozitabominikube.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/vuwugiraninexudelomit.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/zavofuwufebixaxodol.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090948438c28---46570858621.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/63355149274.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/74519889170.pdfIn PDF document text
    • http://honda-vo.com/upload/file/pawuzikemik.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cc99a589---86292711722.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/foxeresapivizibutedubexi.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/avc1bvs23cobrc5p631f57vmli/lanabijed.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/69348519164.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/wuxewonisanivugedijupumef.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096819175ef4---nibojisekaviwobefeja.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labesekekixewunuli.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/39236819898.pdfIn PDF document text
    • http://afro-safari.com/upload/files/lewijo.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vebefijejinixura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=s+chand+class+9+science+book+pdf+download+freePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 15656 bytes
SHA-256: 22c4aea27a52f4a32e9ff239deef66ab8881220a7ab3ba8cb47b10d0a80d455c

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