Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc9c74c772b4a49…

MALICIOUS

PDF

88.7 KB Created: 2021-08-08 04:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1c367377d4797bc9c0e66fe0df82f49 SHA-1: 8f05e652e568cb7af60e494fa60528b967a65e29 SHA-256: 6dc9c74c772b4a496c9b06582729b955c5d230234fd177afd3ea2d347a42564d
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs social engineering tactics, instructing the user to copy and paste commands into a shell, consistent with ClickFix attacks. The embedded URLs likely lead to further stages of the attack, potentially downloading and executing additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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
  • 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://frutapac.com/ckfinder/userfiles/files/9186825453.pdf In PDF document text
    • http://naturalmis.com/userfiles/file/jikuvakima.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/23943920052.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kpl9kcb084pcsmv82j68km893t/48851534803.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/42740939594.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1a976da77bc4680fb36186c6b982c06e/wadumi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a47c66ad2---sufotiteleweripezol.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2bfd83d8c---20071212234.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846b573e96a---nuweno.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d816f478b71---ziwapakurorajewos.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4321ae792---70427415530.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e6a24013---reverafe.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/74522644796.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/tarikuguredowuzuj.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/rjhej8ursua7l0pmrjllen46c2/dojutebulotekapoxig.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/974066249.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/hc70s0bi9r0559qlq1khjda574/noluwidifumusa.pdfIn PDF document text
    • http://shophouse.info/images/files/27196758106.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fcbe96ca74cb7ceecf6b0976acb22164/xipufavosovepegogadebise.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/wadulanup.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/xaper.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zidawikaxi.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/23726469006.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/16917104071.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/31209326599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bitly%2Fwindows+txt+10+kmsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 10672 bytes
SHA-256: 46dba0cba2c9e67c4a5e5a4beb6bc79977965263a9c739373231e742ae4113c7
font_02_sfnt_off000124b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B1 18416 bytes
SHA-256: 194cd8e52c5a03af84c5f4f9a95b251f165fcdf782937327df7fa70232ad5e39

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