Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d1a9628c9134663…

MALICIOUS

PDF

79.7 KB Created: 2021-08-09 23:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5db4e69c8bb95af5da45d3b6d9ee2de8 SHA-1: adc1a9603d055f4c9a487a72e07224fd4f351b64 SHA-256: 0d1a9628c9134663cabfdd1f882fefda3e6b045db399ab01b49458bfe76d8cc6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/klhintddrc2e39mk0ml9difhc7/56749229213.pdf In PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/rufimusopeziz.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/17912838860.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/detikupumadubek.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24a78f9932265ef7909660b83cb4d0a7/31630924455.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/ed99e6f9a89cb3428979b896cdf3d550/5894057720.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/17idmql68qkbb7kj6jhk8lrhi9/82662096348.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/sezipujawetupa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/19244771416.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c86480c3ecf---gazajurezisumudawuv.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/nblbrf2jeqripj2s58neh2ognq/65918363397.pdfIn PDF document text
    • https://mmszke.hu/files/file/tujejomexopewilarugemoxen.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/dofoz.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/65123632923.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/dusupizawata.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/66689630093.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc8a45b0f9---mafajasamonuxapofonibo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d8dqbg09a301vce5i885vitsa0/12178578660.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/30025264696.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210626_145210.pdfIn PDF document text
    • http://esistore.de/userfiles/file/11412290632.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/d4a9f403c0cde33dae1d02e2cf382f46/44277111585.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/39203088120.pdfIn PDF document text
    • http://rhondachem.com/d/files/74089142429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=arduino+projects+for+dummies+pdf+free+downloadPDF 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_off0000d235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD235 16408 bytes
SHA-256: b3b8b8e658fed1a92a66a7f6f03f5672748418987c9b27dba1f1de69579caf57
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11523 11080 bytes
SHA-256: 7a6ab171fadbb77b0e699348743611d0dc0593c6b8a36089b40b7800588cf576

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