Malicious PDF — malware analysis report

Static analysis result for SHA-256 07abc140ed5bdf9d…

MALICIOUS

PDF

72.7 KB Created: 2021-09-15 04:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 159615148675d9d79dae9615201fff2a SHA-1: 1855b65808ba6a9a0784d303d58c9280c2b23676 SHA-256: 07abc140ed5bdf9d95cdc306d39a498954b2f11e340b29a663bd3d8d00cc203c
196 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms or compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of 'wkhtmltopdf' in metadata suggests it might be a generated document, possibly to obscure its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://allytemp.ru/uplcv?utm_term=where+do+i+find+my+number+on+phone PDF link annotation
    • http://hmondo.com/userData/board/file/24143405345.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/fokasubinurepadalu.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/kolasosukuzugub.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/roxusena.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42895467814.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/21823028836.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/71065350343.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/rabadalezifowudadaboxux.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/kofusudewogug.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/71293280735.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3600ccd73697ee202536112046e4eb38/42975901354.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-10/20210910223829831675.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/59013473569.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f95f5db8b---32059880098.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_142645.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614125e5ad4c4---58833055151.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/wusaxeduxurojuvufav.pdfIn PDF document text
    • http://unsersohn.com/images/file/sowutipimom.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/3501064160.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/58881794639.pdfIn PDF document text
    • http://falconltd.pl/cache/file/77247929288.pdfIn macro / runtime command snippet
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/wavekozewujukavoxag.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinIn macro / runtime command snippet
    • 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_off0000ba7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 10636 bytes
SHA-256: 6d6ee02963296c470a66579af6a0cc515558ab15e22098b963443e9b39c1387e
font_02_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 16564 bytes
SHA-256: 78e8e747b7b49c813a961bc2a08b54543d8c4f52d8b5e7e4c914f4e5d8223452

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