Malicious PDF — malware analysis report

Static analysis result for SHA-256 705c9ece209018ba…

MALICIOUS

PDF

84.2 KB Created: 2021-08-16 09:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 6d326f2cb403fb2b97880fd5942c75e2 SHA-1: 4c25ecdf1505c22b886cd4e95301a6dffeed2524 SHA-256: 705c9ece209018ba7c0563904397c8255e1e1797bde9216df29cdee44b5f44c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://archism.ru/uplcv?utm_term=caterpillar+3516b+parts+manual+pdf PDF link annotation
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s376amh94ochq3tgkeugbsamm3/vavetikebewumo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31306371908.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/d46c6df8f2b5ccb8b92c6e4e4d7941cb/vomelitosenativodazejuge.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/kamadodopukonud.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fc3d9cd7353a783bcc5e0801bfb97c2c/55510214356.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/18428201053.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/56383127173.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/49096482816.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/be91aa1a9274aab2b53ceb6ead356b8d/55592752819.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609421f309d63---bizifonadoti.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/8e5d283298e763e1e6efb15a7804efb0/37862873016.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/febupakafarapimemavib.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608922abb3485---7319899760.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/q2eauj30bhmuni3q2kbnjmurk0/51672432867.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/femenepimexuzebiwera.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/nexuxikuzaxuvusizov.pdfIn PDF document text
    • https://superchills.com/userfiles/file/57706298855.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/92404691405.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/33392357418.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9c70db30---notibumobunibiminukanore.pdfIn PDF document text
    • http://farmina.ru/uploads/files/31108510732.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/lq7kf8he31oiak0ceegeag1rqg/kivofilomuvew.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/34830063494.pdfIn PDF document text
    • https://teamcode.net/upload/files/duxelozoratuzifalepa.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/64321950642.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/58be8ffef087c35216b6794c450e3f85/35886525260.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 17264 bytes
SHA-256: 405e3d74c2a4cfc43f196415acd2f3300be04d9e474c8a74ad84066e48a26de3
font_02_sfnt_off00011f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F52 11336 bytes
SHA-256: 50b51470565248025277b693badbc0afda82694886649b3bab27ce17b2808d0a
font_03_sfnt_off000139ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CA 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa

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