Malicious PDF — malware analysis report

Static analysis result for SHA-256 352ed39f67b009c8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 00:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f4647c4836157d49877129f9f82375f SHA-1: 063fb5bd6ac6eef502be3a1dc56278da6c36bea9 SHA-256: 352ed39f67b009c85339ccac4804f6f6d0497df7bb3744df6766e9154740d3e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=edible+oil+industry+report+pdf PDF link annotation
    • http://first-group.kr/ckupload/files/84612567753.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wevepevawulawivarutapome.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210825204326.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/759e89db5193990e4e2e3e92b8349ae5/sisuwujafoziwofex.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/xepuvi.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/dukobakagenasidisokanor.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924e875326e---10797003149.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/63351030210.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/64495091285.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/9fa730814e0ba3842c0813f951efb18c/7806393226.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/ramoniwuwifutiradojizolej.pdfIn PDF document text
    • http://landpas.pl/upload/file/28260858843.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210706023347.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080a95130ed7---xonexunaborukasugixew.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/kukezovogunuwupi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-20/20210520005506924186.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/81fe8c7e3894b09d0ce0db2c46ab4b50/71950551312.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/36236158419.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608c00ffbd277---dadasusodumotevomimidu.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2gf6c1icf3ibvso2io2o5fl661/lobodotoxewirekel.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e38627be---76996292021.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/vamavisegaba.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/0fe97f31f01691d0eae23773c4a998a6/pexitapegewudutanidegu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e2124d01772eb316800717bb39cc1acb/pilodifazutibar.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/7265215460.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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 17844 bytes
SHA-256: b6eb1016ce0f9528ab0624ca477d916f48b83ee12317092873d960bb7257ee03
font_02_sfnt_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 10664 bytes
SHA-256: d0133771769b2f1d7ea755b9d9db6d409fec6dbc32ef31ec5b2b7b41a926bba1

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