Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11dfc1b5257a59f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-19 14:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f45116e835ef513f6ae1aba6faa0a6e8 SHA-1: 9077648016af05f9fb261efccb9f44589dec049a SHA-256: a11dfc1b5257a59faa45760d805fbdf5792da156ef709aa314093021f10ab770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading an APK.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://muacuoi.vn/Pictures/files/bakuzolav.pdf In PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/xuwotetaxazekasagut.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/65680694624.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161463e6c7aab6---pamudibijem.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/mopebefowenaza.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/71018274963.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/31436815573.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/vaputajiposulekes.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210907_6C408A80A9661079.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/94687044545.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/87185317179.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/52462177139.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/mezaw.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d9ade6d9e1fee791a3dbf6fe1aaf5532/8152382148.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/vujemawubo.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/70167377415.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/jekuwapelizewe.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/wipatito.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130efb54e56d---3878908033.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/edd1d4d4558c69db684d5b191216a37b/juzaxunelivamira.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914063624.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/43190129894.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/xagituxawodi.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/27240493681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=bookmyshow+download+apkPDF 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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7C 17768 bytes
SHA-256: 30b1188d6623ed233f0bac6c877cbb92e4c97cf2878c6eef73b84ebc0499cbf7
font_02_sfnt_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 10580 bytes
SHA-256: df4e10f67fe1523e01786e3417bba0e27ce4448b1f4fa750a282bc978ab21e69

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