Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58ecce34c5a62fe…

MALICIOUS

PDF

87.8 KB Created: 2021-06-26 17:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: acab3a9a3bc20fbbb7b2fb12e26c99c7 SHA-1: 19215fe6be221d65f0006df16db18fb56765568e SHA-256: b58ecce34c5a62fe119d1951abe1faea2462a3815e193d25ad62d9b1f41359c8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further exploitation or credential harvesting. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f268f3c010---12328822688.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0c2a6f22b1f18468623a8872170d3cff/94065312071.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b0db748lddc1clbcg61k3ldav3/zunamexevovowamurefek.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e220a4fc94---xarafodemaluxakut.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607137ba8d7f6---guzapobixeni.pdf
    • https://myvideoclasses.com/ci/userfiles/files/6685044183.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d8dacfcdc59b64aae422c60ce38e34f0/rilakugefusubo.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4434b871e---13116774233.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160942f305b435---sidozepuzuwugiw.pdf
    • https://pypconsultores.mx/userfiles/file/rinidotaxixibalamopesiwux.pdf
    • http://atek-ent.com/upload/file/93951392352.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/23095b82898d421afc6ab0b052b20fee/95778401597.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/frfjousb3us6eh940bujhijtht/jovawurefitobixoje.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/50b10b35fb529889fb39c37bb4b9c8c2/2909253574.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607045e407c2a---luvusokugekur.pdf
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/65895133751.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d71924d48---nixesatodisiwer.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/90593e8098195fe8559804842182d058/pebalerijazupulezes.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608579ac3ed8c---20337922057.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7daf2a4be542b6042e8f784e1a1cc493/begijimagesuxitesixatexab.pdf
    • https://fontaine-eva.fr/userfiles/files/67299180079.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=currently+unavailable+see+owners+manual+w204
    • 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_off0000f4a1.bin
adb57fbceb5f4b267dee82a5ae518904fe3052502d5cb92bb198d782de96a341
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 16644 bytes
font_01_sfnt_off00011fe2.bin
b228e8b7454284acb5063200419034905b6dcd742a02c001c89a64b3f961fc7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 11124 bytes
font_02_sfnt_off00013a04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A04 16792 bytes