Malicious PDF — malware analysis report

Static analysis result for SHA-256 79147f9958c6792d…

MALICIOUS

PDF

93.4 KB Created: 2021-09-02 15:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80945e10565c30c91014f8ed11716b28 SHA-1: 702e16d085db6a957349ef325510605d4fc3d00a SHA-256: 79147f9958c6792dbab1795085b05a894d3d29df0bc47963ed922e2d3be76d32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to manipulate search engine rankings for malicious distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611ccfa8c5099---90724587797.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834b5918d31---66438812902.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/rinanoladokoviwazikatil.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/xumuxadawebufunibilofig.pdfIn PDF document text
    • http://stroi-sistema.ru/img/49868242138.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/p5ghk8k3coo514h6j284ofdkp1/48395324398.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/2e67212f3b91f593e6fa82214f04fc2e/kufudipigulifokonakotona.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/88119526717.pdfIn PDF document text
    • https://primer-spb.ru/files/files/54426666172.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/21443329106.pdfIn PDF document text
    • http://chipgene.com/image/files/20210805_175658.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/56264196010.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/97671752299.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/95271616832.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8kcherecca42g0ngeprm506hs1/24405942833.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/ripegodunojovonijog.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/46910866860.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78361f312d---19112908953.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/e60d887ed740241f68852c15f0fcd570/tafodipiguk.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/78751166968.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5a0092f9e---pozavunapupozok.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/rikumaxabudegivosatax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=introduction+to+statistical+quality+control+7th+edition+solution+manual+downloadPDF 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_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 20184 bytes
SHA-256: eab11b8c95e2c8901bba1e5d038200aafb454ee2f1b77b4583a2b53e6bb1d78b
font_01_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 11080 bytes
SHA-256: 08fcd490732a5cf2de9b21ba20e72d23d479011d699a6dda9a4d96423edea888
font_02_sfnt_off00014eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1