Malicious PDF — malware analysis report

Static analysis result for SHA-256 efbefa6574c7192b…

MALICIOUS

PDF

70.3 KB Created: 2021-09-22 12:51:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed526cc02c1e3db37b7520ff89a3c4c5 SHA-1: f0fa3d150929b787d5c221266137c3d8d5070ef3 SHA-256: efbefa6574c7192b63c34c6394d47116fe4533c4bb57866a67c893b204604deb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be redirecting users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=8+ball+pool+hack+mod+apk+download+latest+version+at+apkxmod PDF link annotation
    • http://stoka-saarlouis.de/userfiles/file/72182856979.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/koluxamipixevosaneza.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/66027628758.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/zakujegotoropitora.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/64656269847.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/xonikabelagafilixeg.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345523c6e9a---diribipamawitumikuputul.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/wugitabogezosopojusu.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/kapojax.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210918132929_dw3emc.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/4021320187.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210920024349.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/givelisoboxamifepirisines.pdfIn PDF document text
    • http://liily.jp/upload/file/20210903072314.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/19498200068.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/tozitamolun.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/dedelefidemebasanakosonu.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/49558427035.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac995ab469---marazukozemegamogebuv.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6c4e0481283c0ffd9c79748f66af56a5/48820206167.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/3060245522.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132533fa2509---lirinizeg.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/42229235206.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/vanojogoru.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB519 11376 bytes
SHA-256: 0232714920ed69cbfdf76484076867a5bdbbb290e0169b3e77d49bd197c2c57e
font_01_sfnt_off0000cf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 14140 bytes
SHA-256: d771c09dc81ecbc893c4b858603caa732e3f858cfe93d9d6531432d11a4ceba3

Open this report in the interactive analyzer, or submit your own file for analysis.