Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b3a963f80d9971…

MALICIOUS

PDF

82.7 KB Created: 2021-08-26 00:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 330c297489470b80783ad01de190979c SHA-1: 27bf8141197620175f8fd0746700872107d607bb SHA-256: f1b3a963f80d9971a93ab4a8fac9022137631224a645984592fc7bacabb35b2f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to direct users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9766

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://pkynfe.net/userfiles/file/7044312226.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9ab82e5b327c56ca43cacc91d1cec59a/58166667450.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8f34a4345---kitegupezekuvilodof.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/diladotudugefexopovit.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941f52c4027---jiledotusute.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/851894482b8d9abf33fece03a255422c/niwozifelereweb.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116fe693601b---vemorazinufovud.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e56ce63ed62a4aef7b8a04c2890ae4aa/ginokawoxumawobitivetaki.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/16003344418.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/bijovuw.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/7114583592.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/154368a9f187aa88d79d81962da1f7c6/6878131971.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/vumokutiduxawiret.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/rejudawemipezu.pdfIn PDF document text
    • https://ikima.fr/uploads/file/webaxiwuk.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/gaxebawusojiso.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/timikebuzanajiw.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/bc7843d7e5ece532b6b98f61292b8439/83229865354.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9fe4789f28b27d6b5c2001f734fca6c7/zepavukomuduwev.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/18768080622.pdfIn PDF document text
    • http://veterinariacasettamattei.it/userfiles/files/22124958007.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/40196157020.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/9c34531264f091b4682d62c83c66ea74/30914366501.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/2f7bebf5349c5f590c9652365ba900b8/16537193782.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c588140a6---97529199400.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/66182591426.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd0477bd0---texupibukafivabez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=normal+vital+signs+by+agePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC75D 15600 bytes
SHA-256: 84ea13725d643e796e4dc5ecf5d992a11fa376749a40fda8ebeaa95c40cb43a0
font_01_sfnt_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10748 bytes
SHA-256: 064c42b999b486581e2a1733950273b778ff56dc86cc0aae496861059b4e7563
font_03_sfnt_off00012053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12053 18020 bytes
SHA-256: 834f6631b65ebcfa6a1c5354725f55a1ddc9646b0aec89e0eba96ecdab50970e

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