Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3489c023aa5eda7…

MALICIOUS

PDF

106.9 KB Created: 2021-09-05 02:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b377703dfdde8652ab9a9bc75dc5af93 SHA-1: ce01d943148a575996a845b3e8b6447c94c4f222 SHA-256: f3489c023aa5eda7e6359da9f59251769bf12b8c8bcaff1e04909b7d2b146b08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected 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 compromised WordPress sites and other disposable hosting. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/uplcv?utm_term=stroop+effect+pdf PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ul9uuian04bsdmacj8bo85b256/7211121065.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3891222150---kibudekuretipewud.pdfIn PDF document text
    • http://moffatcountyhighschool65.com/clients/878592/File/bowexixapisenokenanumige.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/poevoiobvlh0gl99p37ohrlsfj/47145862861.pdfIn PDF document text
    • http://dzbnf.com/upload/file///danawukek.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/vegagikebegiwobi.pdfIn PDF document text
    • http://stylekd.ru/files/94035601805.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/vulupuge.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f667e916c---2968189108.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd82647781---gotunaluzujosub.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dda418e231b---72209714493.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb58e559493---kawiza.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/zipebuzupumozipiwukef.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4edd9275---35726548964.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c12ad5f66---87109734690.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/pitakilenijenuwagexo.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/10487424422.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810fe12f0f7---16274821035.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/worugagez.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7d7d9789b978e78952b073ccbd1e6df6/bunowemur.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_off00013cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CDF 19236 bytes
SHA-256: 6690a83034d1b0d83c5e44d049f4896b74cdd4d936babb56cf87b3caccf76332
font_01_sfnt_off00016f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18791 10116 bytes
SHA-256: 74d0946ba87693ee870984ccadda339ec905fa9dad4cf1ab5890c49c03771c9f

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