Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cb1fecfd08d565…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 00:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2955b76d502165936a76b24b6e7dd243 SHA-1: 900057b0f36d4b0de15c23142b3174da46f85e34 SHA-256: 14cb1fecfd08d565d4d096ea745bb9b4f0132075c16aa848d27cb54ad11bf627
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL findings suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=pokemon+black+randomizer+android PDF link annotation
    • https://efnnma.org/files/file/99677599149.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/92ee9c0929b0507d7f6db21951cce6ae/67572972621.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d54090eed---rewekabigedituvimu.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/82391397179.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/moruxogimutilaw.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c65bbecdd---xusekoxixiz.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///rijokufu.pdfIn PDF document text
    • http://goldia.cz/data/file/nimegowugalef.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/62466170719.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/39878304976.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/xozogenakomete.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/86973268724.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/sutabovukefuf.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/lulilodegenapudabi.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/81999598712.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/59065094203.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/retapovomomixuvalepuwarur.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/35453762034.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/mipanuza.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fasikaro.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/75985743473.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/24695635358.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/91282510413.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///35567823168.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 16712 bytes
SHA-256: c3c6d186fc93eee442cffc50e46e92b87ad34582a5dad76aa8e36e26617edea2
font_02_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 10560 bytes
SHA-256: 3110a130957fd1f76cc3f2944ec4a434c060cef335b1b8c420485fa5ba6be149

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