Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a78d9628c42202…

MALICIOUS

PDF

87.5 KB Created: 2021-07-22 12:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 523104946e75c8d99495fea2941b944f SHA-1: dad935d3cbc57f8852396ffa41c319651b83150a SHA-256: c5a78d9628c422029f2110223b26d71b6f6272697e66b05a623f4dffe3419771
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://soles2walk.cz/data/file/45884946466.pdf In PDF document text
    • http://antifftech.com/uploadfile/file///2021051907515783.pdfIn PDF document text
    • http://derma-dts.de/files/file/97556972934.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d4478cdbca239f9a19ccd1c24ec3ad1e/zivisuxizobetagaduku.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/114426589.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d8e79f3840144ce12b51f97db6c67c5a/vapixilimurivif.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/31edfeb16b7c234b941314e50e801a77/kuvudunurekepofipab.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3n0b0d478r3c5qeg3tqliqn3u2/sowodunor.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ipf5qe1s2pj4qpcu6v5mgvsftq/90243678451.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/9758c4924242887c169d3508c7be55bc.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505203439.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/56b109e2ebe71a54bec1ca6dfac562d8/wuwukujogifiliwurewi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/81839640fac731d71d5607b0c5b3f58d/degixipibamezunev.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/12abffdd840ab1e5792818fcde1e1185/50179608240.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3ce5d4c0089e6b8696a3ffc080e74f65/60585701094.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/gerorazelelonojitipejit.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d99cfbd311---baberiwux.pdfIn PDF document text
    • http://thaide.org/userfiles/file/24540758676.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/gafitinukifut.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/7221c7c8bc82f9c55255b5188a92eb9e/nugebenadejitikam.pdfIn PDF document text
    • http://nktrading.qa/file/files/72770734845.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fcab8fd9b---dubekovorozelerizirizogi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca82aa5c4---jinukurasizevamin.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607407ff17d9f---50551765139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=year+4+maths+fractions+worksheets+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_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 11080 bytes
SHA-256: 92527f1a292cce526ecb1b01b310d7e12410cd6ff5ef584bb015815e71e066ea
font_01_sfnt_off0001083e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 17516 bytes
SHA-256: 6c77d2c494235f98b4d522508530ba737c7f10eaac81a87b864f6302f8431eb4
font_02_sfnt_off00013545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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