Malicious PDF — malware analysis report

Static analysis result for SHA-256 6deed29603dd499f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-02 01:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54415674a889eac1278066ad269cfd99 SHA-1: c7e4e8151ff8cdc795c698e580abe15437a9c428 SHA-256: 6deed29603dd499f7f086410744f26be8fffc0683aca4fb141c39938cd609688
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=solving+quadratic+equation+by+square+root PDF link annotation
    • https://baoyi-chuck.com/ckfinder/userfiles/files/54779278030.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-28/20210728193607351119.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0a63c77164fab4477edbcb4d2e6e593e/62759150038.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/ralogizarirelasoz.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/af28f32f97605f16808fe732ff2ff5c4/72244440772.pdfIn PDF document text
    • https://bio86.net/fichiers/tijelegufivejojopejuvuja.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/76258093186.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/dinape.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ad33edd8ecf7e9d108cfd50cf297841b/miwejujuramasajeboturokub.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c699310955---josepodukovukefufofovu.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/bemebipixivemiwevebevar.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/momidukijekexadura.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ce2ecece---benolid.pdfIn PDF document text
    • http://salwex.hu/file/zegujel.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/a5a4d5189a5c94cfa1d5870faf4fff08/nadime.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/niwofi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080863c54e03---wogujufulu.pdfIn PDF document text
    • https://patc.fr/imagesfile/52012758305.pdfIn PDF document text
    • http://benly-carson.com/product/files/22908399294.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/fawabotetejusipowoli.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088287609d9f---68808962628.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/05c899e2df912ed77ee2e7d45b51f54c/45137867420.pdfIn PDF document text
    • http://okun.su/upload/file/tovemef.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/bajufudewak.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_off0000c536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC536 17364 bytes
SHA-256: 8fe83394c599bc6c0069eeef822eb0c6777ae6f74ee7b54c5fb52c955ed8f7e7
font_01_sfnt_off0000f260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 11188 bytes
SHA-256: 2cb33459a03f500ef62267216f3fe1921b2e6513d261f9312ce0606d2fe0dc8b

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