Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42655c3c7d0ece0…

MALICIOUS

PDF

94.9 KB Created: 2021-08-01 10:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 086421b18c2dab19841bf7c1eb2fec92 SHA-1: e653526cf7de5398ad7df4808c934261b18b0d57 SHA-256: c42655c3c7d0ece083682ab99b11e56051912db3e5dc408a5d604a3e1fef07eb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be compromised CMS upload directories. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=esoteric+bible+interpretation+pdf PDF link annotation
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96f6daeb6---nujajuxofabusosusamelul.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48dd8c778---58356780626.pdfIn PDF document text
    • http://anpo.vn/upload/files/nemanumelezoreguxegij.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2lk4hehmtaa2a97ldruqcith6d/36344082567.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0ec9ea1f3---98321047100.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/32780466209.pdfIn PDF document text
    • http://orderkai.com/uploads/files/madudawevot.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/36262335345.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/81284cb0673c9a352de95f32d91ba002/jufusinojolotuwotupirat.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/93505194848.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/fupobolupumamuvepefawodo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lj0358lgqdeg94fgp6mi1n9umo/920849282.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d3c52c387---18888204935.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7705917a6---34515610535.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/fupigedu.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/72543309095.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/37207812746.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfd4462562---rerefixat.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/9c1d491ef46a22198f0fc08d706bb2a3/81493403842.pdfIn PDF document text
    • http://targdenunti.ro/userfiles/file/lidofizutenezuj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1069bff2c---nugikatibewoj.pdfIn PDF document text
    • 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_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 16832 bytes
SHA-256: 0e5489330af85e3d37ec270ea0ffdc414624e61f9e363e4b76dace76b1e71779
font_01_sfnt_off00013e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001569c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569C 10736 bytes
SHA-256: 5210dd23312e0804870dd41251375364ac34d79347c68a7c7d09fbdfc60fdfb2

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