Malicious PDF — malware analysis report

Static analysis result for SHA-256 e353849d197c85c8…

MALICIOUS

PDF

107.0 KB Created: 2021-09-05 07:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6fcefe835e31522fa530a444f6cdf89a SHA-1: 6dd5c98dd9362af737b439911b68d9361be4de06 SHA-256: e353849d197c85c8db5f103c10cef6b24cfd559804669fbb8ba1de15e036d6ac
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610eed308ba22---javuvikugadimut.pdf In PDF document text
    • https://www.campacinter.com/image/upload/File/fekotibaga.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/97501683316.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705c15ee5e1---pukenuzimirawekikeja.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/99620237091.pdfIn PDF document text
    • https://alpinashop.bg/files/guloj.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160948fb71640d---nulosej.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/jidulutakawaxatob.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607498e8d6562---rotiboxufoxusugamexidodar.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/tipigabixazepugijatuk.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/64873175168.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e399c6b482840c504c11a14fc94ecbd/pezapokovibaja.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a65c3bf7b6a5e5b377ed47162867b3d3/83392042849.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/42580d16639e95661f9c0895eec243ad/30421078085.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4665dc60c284d0d2b4b9f9beb0addfc3/mumixunu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/gvmfk69ee1qavagdoslqnq7ee0/36773253414.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/wisusatagiwadamivo.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/gofidixevimenemew.pdfIn PDF document text
    • https://nadamasristorante.it/file/wuwozasu.pdfIn PDF document text
    • https://landbar.com/upload/files/29170809286.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/pabaderuxisolevegexexagaf.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/12281592768.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/tedararesire.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/76421766688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vinschger+h%C3%B6henweg+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_off000132d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D8 10744 bytes
SHA-256: a535d9fdacec786179aa8e4615f0b370c8e4ba7991602d2a08f1a4f7490955d2
font_01_sfnt_off00014b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B3B 22364 bytes
SHA-256: 820fe50b25ffedc75764150d284e7386e7e91001a4cadf9bd6421c673483d2de
font_02_sfnt_off00018401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1