Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb7c56c8afc00bb…

MALICIOUS

PDF

169.3 KB Created: 2021-09-07 21:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb698fb5a9ca3ef3601f24502a321502 SHA-1: 2fa69c4bd1f8136bd1bf53ff2abc5688149350a2 SHA-256: 3cb7c56c8afc00bb0162631f528d6419c67fa665fcf359c146c0964a93a6d972
236 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits multiple heuristics related to malicious PDF content, including compromised CMS upload links and a link farm. The document body, though heavily obfuscated, contains lures that instruct users to interact with command-line interfaces and call phone numbers, indicating a phishing or social engineering attempt. The presence of numerous external URLs, many pointing to potentially compromised hosting, further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kitapkapla.com/upload/ckfinder/files/lifow.pdf In PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/putivezoxorevazolozaxo.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/davixiri.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/4340009821.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/25705410344.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/lafezimulazazozuz.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/lowevawawugoni.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210730_6739B953A70D49B7.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fd99db907---befawamowasexevidewevax.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc6ddb38a4---18572742386.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee1add407---59769315916.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/josagogit.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aca000cde2a---zetuluzeluzugetakemogawid.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/dofuzexokutegimuxape.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/dojobofu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06f8631fc---munuzepep.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc426447a3---sulisumusigenirinodi.pdfPDF link annotation
    • http://huile-de-nigelle.info/userfiles/file/91861219368.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/buzotuvinif.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/sonimisoruroxuwujutam.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/03a2ddf232e8664e940b8fd3f7d867ee/29897959132.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/luwixeketidevodirenoxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=edit+pdf+form+ubuntuPDF 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_off000231ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00024a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A04 10376 bytes
SHA-256: 774bcaea2673b788c9e7e3e0e1a53cf1188ebfd0f05aad8546d8f0e2df75dbee
font_02_sfnt_off0002611f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2611F 20680 bytes
SHA-256: c96914e9d151a80248269c4406d0a1a2f23dba3ad34621a67fc306f1a628d96f

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