Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dff1dac41819508…

MALICIOUS

PDF

104.0 KB Created: 2021-07-25 08:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c38240654409613cfe879cdb7ac39118 SHA-1: 65bb909e8e87d0807626651d48d758762d9340e4 SHA-256: 7dff1dac41819508cb550067f797258777a172bca34c8f67af5a85332751c33f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071528bee163---xirelamisulu.pdf In PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/86234872352.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dien4n1tc4hq3fetarhi1ulsgt/18001980292.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19306b9758---29482296509.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/51348341598.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c415a05fe13---redogoxetomigo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/2711306019.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/k6559knf7n57hderfvjvc42dlg/bigimijonabifokinu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/s6i18jelbi94t3pmo3g18rgqsp/nekugun.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/67896161344.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-4/20210604223755287419.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a784e0729c2---fapumefo.pdfIn PDF document text
    • http://huntland.hu/upload/file/niruputarogewekuwekava.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/17833064844.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/50483957920.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/4640921419.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/4fl755v5a6gf82q0386isv3ial/85916167635.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/65025364123.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fabbac90651---82534824377.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/jomozilanubonifejokefok.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/af1af105cc80cbf8eaea4aba0a8ada8d/puvadavulafigadepiwugo.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210607_59C4A995587F7F5C.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vejudowewiwe.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c921967930f---16294347214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=strike+force+heroes+2+hacked+unblocked+arcadeprehacksPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA0 11244 bytes
SHA-256: 7cfea187bda55ff23bd8db78424c3cdce7d680fafa7bd3a9bf906f6bdb8cddc1
font_01_sfnt_off000145bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DCF 20128 bytes
SHA-256: 394b777df87aebd46b8631ff789c22642ba86aaeb5433105ea88628ad5803cf1

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