Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dc4f6a3051b36b…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 21:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cc5912639089b4391f59d4f21a085b76 SHA-1: d9d2e49a857675f1e20eeca464724aa2b1861f41 SHA-256: b3dc4f6a3051b36bf9e8235c47001aba4991c72c2822b7d5f0779599ce45adbb
212 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and links to multiple compromised websites, indicating an attempt to deliver a malicious payload. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a secondary stage. The ClamAV detection and ML classifier strongly support its malicious nature, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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 https://fokusmedia.com/images/uploads/siganoxixepiba.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacae723a3c---lozozigazoferino.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/10385ae0404451bc2810a5a8ff29e857/70477940312.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/tesefatexagosekasotef.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/rmrhqok87e3k2cb1ucepovumt6/99612607039.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/rinutuwudajilavogusegezud.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/6518642fc8169df30dd6d8f6ffc48967/21519267858.pdfIn PDF document text
    • http://caramelitos.sk/files/2143401463.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/befoledeloralejutewiroki.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/38744992419.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/98573858162.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/gabozenekew.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/53239296202.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/fobadano.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210608_B447F9A226F94B9F.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/96f5lhg4t3rkirh9odd8cubh4k/kosabavekukexojadit.pdfIn PDF document text
    • http://primaneighbors.com/userimages/kejivukagoriboduwitojabid.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6t9ds89aoa8pcehsnl9qcklgg1/87018649114.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074ca59ef1b2---kodederukokuzuxagazevun.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/sewapanowibekeguzeviwiwo.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/gupowosovobivuxenekutovej.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/wakefofovavodipin.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/33503481131.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/mepanetegelirubemuvarafi.pdfIn PDF document text
    • https://techlan.pl/files/file/13855845700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=telenor+3g+manual+internet+setting+for+androidPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 17544 bytes
SHA-256: 2761c318a63e4920a4e7f20ce08d0e98c68c1fd71ac7016fd1b7b830def0626d
font_02_sfnt_off00012487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12487 10932 bytes
SHA-256: b9ee0f251e76e4e440349e61e101c4af3a28c3bff785738c126ff539a6405270

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