Malicious PDF — malware analysis report

Static analysis result for SHA-256 8438711754a2b5c0…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 16:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: efbd80537f8c218813ea2f6bf1cc559b SHA-1: cf86aebc07139e03f0b7eeebb60f8416c1f11513 SHA-256: 8438711754a2b5c0e2e8e061aa7d95f87da727cfbee71e821ce4278a330ddfcb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. No scripts were extracted from this sample, but the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://abwmarlboropike.com/uploads/files/sepazided.pdf In PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/3ea40b88544f83e451a14c61a2ea5d1c/sesapivixalodasa.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1fc7a26ce---36538883775.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zomikeda.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/93247282411.pdfIn PDF document text
    • https://hirurgija.me//files/dafogaza.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/41f383788752ac3ef74217efeb194e67/51980280690.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/vibaka.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/mujome.pdfIn PDF document text
    • http://erimti.com/userfiles/file/7493959987.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/trfdmemduhqfc939e1hd9glb11/tonavilawafijowonudixenok.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/53265825171.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/wajivu.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/rewixozabo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95ed462b4---pikejetadimetedugaruje.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/tezinubakule.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a527c7bff4---lomisijuviribusokemupare.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/gowoga.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/59408124073.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/98fa8929150cc7dd98f792acfab2c739/56542378425.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128e1f4224f1---78558087195.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f8e3llkmnclsbrjvc97226j8l5/mudepaxalozevita.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e054d2a694e2406e31fe361378f93681/34415317942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ginger+farming+in+ghana+pdfPDF 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_off0000c752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC752 10552 bytes
SHA-256: 035be7e0ea7fe4278b1f6ec6df8de228c3000e0d4cb78f3a382b1688c2059289
font_01_sfnt_off0000dee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE2 17036 bytes
SHA-256: ab596cfcf7838ccca654d9cdf984d0620d3d58d45ec86367a5290ebd9338cc24
font_02_sfnt_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1