Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c5cb3ed00b3c68…

MALICIOUS

PDF

94.9 KB Created: 2021-06-25 22:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 410495a3f476aa591aef273a14688330 SHA-1: e64955d4160083f5b9dcfe7df6ec00966f2fc1b0 SHA-256: e9c5cb3ed00b3c68d9a640c5bf23ef40d5a633a7a7e854f500d7302843c64546
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many of which point to compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and a high number of links per host suggests an attempt to obscure the true destination or spread the malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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://shuimotongyuan.com/userfiles/file/bidononotut.pdf
    • http://podushka.by/files/files/temop.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/2rrfhfrf5obomsgelo18sebdqf/41908879567.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28b6c4937---bitupujijipikimu.pdf
    • https://fontaine-eva.fr/userfiles/files/88612248201.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095427aa7406---37165890014.pdf
    • http://lookkorea.net/userfiles/file/dotasesebe.pdf
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/la8blb9nioa9k7e3501k47r3g9/kavafipuzejovameruwikid.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083ee6519337---fiwufiki.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094850d3802e---fajedukupesifixiwejad.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831bcb674cc---97649618558.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e729f926---3202766313.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bde46a8dba---44784928901.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094a149c8a26---68041548251.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4dd95ee39---lawujasaxel.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/53549900880e3ae52bae84f6399802ad/87842215930.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e8ebc48c---11880094931.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/61ab71cd77b943038586e8b54a5da617/37283992030.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/0e62300dcea93e8f3856577cac6a29f6/vopemovozejipa.pdf
    • https://anthonygillant.com/userfiles/file/18800582851.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/heb341env4v2vu0kdi2p9macge/60478299427.pdf
    • http://prosquash.by/data/valov.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/933luv6iitnhg89f94aa12k2c6/32759849103.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8e949be76---94875530509.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090b33988c68---nupowinekid.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2114dd656---5316945369.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/v47jpeq2ld5i3aimgg05hn6gnk/tofefelozikusozupax.pdf
    • http://clarasonic.com/upload/file/jezeramo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pharmaceutical+microbiology+by+kokare+pdf
    • 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_off00010997.bin
2aa011994a4a9712450d58a4b20c76df52f1aa1689c74ba0454166a512c00d49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10997 11240 bytes
font_01_sfnt_off0001238a.bin
5ea96f4ff61eba1fa3cadbced564d74f8d52733740375c3b4e6903bbd030fac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 18348 bytes
font_02_sfnt_off00015436.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15436 16792 bytes

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