Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94eccf8e5e76ef1…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 02:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f48e1396a627233f3f3ec3e7232e0ac3 SHA-1: 89d5c41d8f525cb55b7b331e631a2ce9e7e8f358 SHA-256: a94eccf8e5e76ef16bd23d6bdaf888bdbafcdcd73247e016a98e0465ee43965d
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, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable or compromised domains, likely for phishing or malware distribution. The embedded URLs and the PDF structure strongly suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://sieuthivatlieuhoanthien.com/upload/files/vodefov.pdf In PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/juzadejutawaxodi.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/loxomamem.pdfIn PDF document text
    • http://cecev.com/stockages/files/soluwofofiki.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/3ed6c129873a3054a533ee69bc54b705/zowisitumasure.pdfIn PDF document text
    • http://asvpp.fr/pdf/39932347167.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/98438302264.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/68800700905.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/52174591794.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/37490755405.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/65783618107.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7la2hs429b7v7d6udl7jr2l031/45193676227.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/xafomo.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/sitafaxeboxed.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/de4169fcc24a0262415f039345a1c4be/83724957216.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/dedakuzujob.pdfIn PDF document text
    • http://spakimthi.com/upload/files/xodes.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/sakagixodut.pdfIn PDF document text
    • https://everestart.com/images/stories/file/pojajitifutilozakuxob.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/fuvivududakadekukefo.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/57189075570.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/29838065212.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613737767a495---86547576236.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/funumovefiluge.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/95914241366.pdfIn PDF document text
    • http://denledmpe.com/upload/files/30873994556.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/54817431190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=kaal+full+movie+online+freePDF 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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 17272 bytes
SHA-256: 8e9f4c3ac9490491f3b02b08ecc0a0b699f3519d7e49baa72f71a5b8f3422f7a
font_02_sfnt_off0001211d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211D 10268 bytes
SHA-256: 1d6d3f2107d7d0165bf487f9e15fb3d344b60188642d81c46f0e9e6fab351cc5

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