Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9c87be3cbad562…

MALICIOUS

PDF

107.2 KB Created: 2021-09-20 07:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 200cf13dab939dc16a313ca2419924ac SHA-1: 66213394ff00d163452a6b42a18a8714b99093b7 SHA-256: 1d9c87be3cbad5628492de1b6cf360224e4aa32921dd49bfe55eebeb5dbf9a89
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious, along with heuristics for compromised uploads and SEO link farms, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9828

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://huntic.ru/uplcv?utm_term=samsung+allshare+app+for+android PDF link annotation
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/roditamep.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/fozedazidetogawimifogab.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/63027852461.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/ravurinoz.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/zawebewubigupem.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/jefegadejubikan.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/7787853795.pdfIn PDF document text
    • http://merwepizza.com/upload/file/jofitususigi.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/kikuwofu.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/60919568892.pdfIn PDF document text
    • https://andana.us/files/files/paxej.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614676f3e2ed4---84192026440.pdfIn PDF document text
    • http://bastola.org/userfiles/file/63340146474.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/tefofukodepiroxugozagetoz.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614528ff27495---53233129157.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/sinowokorezazepeku.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614068582d6a6---xedomibikebuxapot.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/puzovivupixojalisefekap.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/52949862710.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314448228c1---47553796494.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/56576873625.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/waxemeruxexujuvinilid.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/58626325413.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/31115351565.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001291c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1291C 16588 bytes
SHA-256: 374869ed34c5ea9e5bd4d541386bfb184c8ce726ab8ddd334170ccd035d28f0a
font_00_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 11024 bytes
SHA-256: 5e526eb37ed80f0f2b4a0474dc593f9a0c6e8243b120e592872c30af38335eb9
font_01_sfnt_off00011f64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F64 2160 bytes
SHA-256: 916d6b1a1b442e64367531db8e82c369c242f70d4f88e51e9ed75337dc071f83
font_03_sfnt_off0001402a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001583c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583C 28724 bytes
SHA-256: db4fc7292a2e056307a36aa175e8e7684451eb773d7ad56f6cbc010fadaadc37

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