Malicious PDF — malware analysis report

Static analysis result for SHA-256 7faf20fedbe31e40…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 21:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbdbbb8d0be1d000a592a1272bf8c5ed SHA-1: 0e080fc3a7ffaca13069232b9b24a8c4196ae6fb SHA-256: 7faf20fedbe31e40796f8c72501ee1cb32e13b7a4d34a9eafac822679bd1ebde
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to manipulate search engine rankings or distribute further malicious content. The document body was unreadable, but the overall structure and heuristic firings strongly suggest a phishing or SEO spam attack vector.

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 http://op-gold.com/ck_image/files/lujiwoxomotodanifubularit.pdf In PDF document text
    • http://phukiendoxe.com/media/ftp/file/70258514785.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613234e24f45c---viduvawijidezafexujokobo.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/vipedidolodi.pdfIn PDF document text
    • http://bienbao.net/uploads/files/biganonu.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/tagedekofanex.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/papevafob.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/12126598449.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/veriritapisosupakejagom.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/77215356372.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/xonarerebuladerukapuz.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/pulijinolepatut.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2568795fb---dupavodozonovafuxowenoj.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/lebutomapa.pdfIn PDF document text
    • http://sushibelovo.ru/files/zofumetusenamibawedigad.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/mivojuba.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/13671924156.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f063fcdb8a---xerewisevinijanababo.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210913154833.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210909100352_n3aglu.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210910075720.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140872a878ab---pamaru.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/6748557370.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/povusurexamog.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/16662751327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=change+language+android+programmaticallyPDF 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_off0000bece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBECE 11036 bytes
SHA-256: b7e41072b6e86196677da488b1b63ede0d0f8999d14c40f2f91a0c6faa0854ee
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 16568 bytes
SHA-256: 918212c938c06b03397be8a7a724550710ec09a72aab4b241cdec5d32c8187a2

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