Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1526e9e9da0843…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 02:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 885cab3cf2db5790c6bfd80c5fbfc6e1 SHA-1: 2f8e302861f14cca42b540493ccf46b322f4da0c SHA-256: bd1526e9e9da08439a519fb6ee8cdefc789fc7f65f775c1abb67040c01c72414
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, designed to trick users into downloading further malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest a phishing or malware distribution lure, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 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.
  • 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://zaun-produzent.de/userfiles/file/rujafudizuwifanamofoso.pdf
    • https://lasanisports.com/files/tabinabarulowa.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087701134a94---84180480353.pdf
    • http://saga.diamonds/uploads/ckfinder/files/savadivexuguv.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/682dc59e9b4092e5812f95d34482c21d/48433200369.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e73aec5c---fanasakupape.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/27f2f1ba5651cfdc3691190cec028582/mupafajaxazekofigifura.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e98b32ae42197f675d813eb498a9a7c3/xajarufevexij.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1da61c51---4118730383.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e47ae62215---dobelabekikulorajupenuna.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a53483d952---97200661061.pdf
    • http://thanhtindesign.vn/uploads/image/files/fixazuzasob.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/d0925fd4e00bfa8c7f58ca7cba63658e/betuju.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/40875dd91152ae8c54c5e718390440a4/34564558185.pdf
    • http://shophouse.info/images/files/tubatopiwotudeguxivazeno.pdf
    • http://ndt-tl.ru/upload/file/luzut.pdf
    • http://www.cafeinca.com/img/public/contenido/file/56088923796.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a106ee5aeee---80740659352.pdf
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/fowix.pdf
    • https://nguoixunghekiev.vn/userfiles/file/nekipojusagetedufutagini.pdf
    • https://parfumzone.ro/files/file/wasoji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=to+measure+time
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 16792 bytes
font_01_sfnt_off0000fcb8.bin
8c6d57c672a90a2420a7a4a6577bae6398ccf877c20bd49360c1bcc1d68d6226
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 10184 bytes
font_02_sfnt_off0001138f.bin
8af3f87919df7e3e3da5fc9a43292c23af09c72ba8ec463fca701819e3f77173
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 18424 bytes