Malicious PDF — malware analysis report

Static analysis result for SHA-256 5604e26b304b7315…

MALICIOUS

PDF

105.9 KB Created: 2021-07-19 09:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2ab4469c0081949c377da464bfb7531 SHA-1: 24e6fb46d1aca8d9c830015afdb42b7c25014c05 SHA-256: 5604e26b304b73150e2919964e46a10154c556cfdc16fc35d2715bf6ec3277f2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://doktor-okonski.pl/uploadimg/file/tatenaxisa.pdf
    • http://inspirationforexcellence.com/clients/66491/File/sexozaladamisivakugo.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/fbm5d5vma2qkka1nk2743oevot/21538146801.pdf
    • http://syarmarka.ru/userfiles/files/18777853222.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/erogauoj4fmknb3thbh19pd5o6/86558673375.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/143025d12b09a5ab9ff139d4a22437c7/mivaj.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/jag0sif8fsvp7h8b8schniuun3/zedixorezebapapenagepuk.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2a3cced52---kagogetofepotavoginuged.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/gobirajisudozibozaneg.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/45345004599.pdf
    • https://monyetmesum.com/contents//files/17447326291.pdf
    • http://industrialdevices.in/uploads/69962448018.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821bfe3de10---polok.pdf
    • http://mt-filtration.com/uploaded/file/149099741060ee29567edf9.pdf
    • https://samarpanbharat.org/trila/userfiles/file/89113557925.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c8d1c3d76---nubotodujaras.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/kb0joc25r1jvlqmkaeld8s0kd5/napunijagag.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9b855c66c420fa67a7dc95cf6af6dd37/bozekoweti.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081709844c9b---risewitotuboguze.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jpcf2l0kkrurse3kin578fciue/tesedip.pdf
    • https://abofahed.com/userfiles/file/zoliboxijok.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a7a7025e---wumowadomuratenun.pdf
    • http://baigeleather.com/userfiles/file/funorobov.pdf
    • http://mjsolankifoundation.com/fck/imagesfile/fozatipen.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=strong+societies+and+weak+states
    • 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_off00013d06.bin
5f05a02a8d08345135d59e0b966e89a9a8e2f630cc461ca680a310f863aa4614
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D06 17124 bytes
font_01_sfnt_off000169a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x169A4 16792 bytes
font_02_sfnt_off000181bb.bin
e785fc58391f15840e776f1221d5bb93d61ca7f2aec4dbd46b960e08869b68bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x181BB 10752 bytes