Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dd3057d7d26b1a…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 02:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df2ef3b2a5c4a29b2535b455c585fb41 SHA-1: f71674df89187254f5ff72a1af8b945e3e9fc4a8 SHA-256: 19dd3057d7d26b1a41f6324be8777acdd6aac3db2cdef86085b6695759c5b513
192 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised WordPress sites and other disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of urgency lures and download buttons further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://reversetheclocknow.com/ckfinder/userfiles/files/31355382258.pdf
    • https://biocoils.com/img/file/tivijeruseki.pdf
    • http://guides2alpes.fr/uploads/file/59509109717.pdf
    • https://www.mnogotrop.com/ckfinder/userfiles/files/warok.pdf
    • http://coffee33.ru/archive/file/89822200803.pdf
    • http://klimatyzacjaradom.pl/userfiles/file/37576700627.pdf
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/wagokudopaxeregetaso.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0d7000db---xoxonanafisokarerolamovam.pdf
    • https://perfecthospital.net/ckfinder/userfiles/files/mavurimob.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c029dac7c---lepekuxasugepalufelej.pdf
    • http://scvumaichiramen.com/uploads/files/37167110156.pdf
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/14952141705.pdf
    • http://adidravidar.com/ckfinder/userfiles/files/xagawitoxifakodalugom.pdf
    • http://ohxto.com/uploaded_files/userfiles/files/fekebivejatulotoligodije.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/gntmphphsf66mnb1tnisrlhhdg/zugezabiwufoniza.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/82464845067.pdf
    • https://perfectsextherapy.com/public_html/userfiles/file/fofalugubofegitubig.pdf
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/bijegirumuxewejamu.pdf
    • http://www.solarwindependence.com/ckfinder/userfiles/files/7841493201.pdf
    • http://hungthanhauto.com/luutru/files/vurepawubisokadalor.pdf
    • http://thermogroup.ru/uploads/files/govudelosuxinugojukuwuxi.pdf
    • http://oticonshop.com/ckfinder/userfiles/files/29332617321.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb34a8b424---38129411015.pdf
    • http://scpt.it/userfiles/files/80681998759.pdf
    • https://asthasupermarket.com/userfiles/file/nudedidunodajumovuzana.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=qr+reader+iphone+free
    • 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_off0000dc3e.bin
e2f3cb3a7da74b6cb4c25561113923cbd22890f466c1e50c4eaa4f29158ee053		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 17852 bytes
font_01_sfnt_off00010a97.bin
497b6502f6841464c36dda9b8a2279bc77d38205af8aa8dcfdb00284b1a0342c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A97 10340 bytes
font_02_sfnt_off000121da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 16792 bytes

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