Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4338a0b171dc89…

MALICIOUS

PDF

83.0 KB Created: 2021-09-09 11:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 720f8e00dae88c2749b0a3fb7c30b92c SHA-1: 1779f7bea1ddccf69b2a81a09d2721dbd6542ddf SHA-256: ed4338a0b171dc8994bc0c4b812c70c9d65d07806b75c46b6e441c9f795b4072
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting, disguised as a movie download. The embedded URLs and the nature of the heuristics suggest an attempt to lure victims to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131540fb5f94---60096934234.pdf
    • http://esejsc.com/upload/files/22118931756.pdf
    • http://smenergy.kr/uploaded/file/1196988176136477b1ecda.pdf
    • http://astorandblack.net/emailer/userfiles/file/pominaworokabudonolaxeg.pdf
    • http://cualuoiskydoor.com/webroot/img/files/vonun.pdf
    • https://bdata.vn/upload/files/sajufugovokafuzonalimil.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139a804bf328---golitodijiv.pdf
    • http://soldearenales.com/galeria/files/54606246278.pdf
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/29175567311.pdf
    • https://fullgame.hu/uploads/files/gobakeminewijanaluzabob.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/82125551666.pdf
    • http://softwarefactory.nl/images/file/47771982136.pdf
    • http://firstcuwire.com/file_media/file_image/file/25465887821.pdf
    • http://hublihorse.com/uploads/userfiles/files/51113682160.pdf
    • https://elesud.it/img_pagine/file/nujepofitiwifunir.pdf
    • http://honghuibio.com/d/files/44088455428.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/zideminilukipofekuseri.pdf
    • https://travellifeafrica.com/ci/userfiles/files/kesolejedamona.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/69cd582c88ec8bdebd18f6783098044f/tivovomaradimi.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/janelepagozilapoja.pdf
    • https://cplastik.com/data/cms/file/wofewevomiputetiwek.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9809b886---jufizepi.pdf
    • http://ssanadia.in/userfiles/file/dulozoja.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/394efa45b2aaaa5068bcb07f3e58e819/51644485441.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=shivan+tamil+movie+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 16792 bytes
font_01_sfnt_off0000f658.bin
9adcaf2483d15e61c4c91495a5c5d7ca702410dff2610440e844e9ffbf77edb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 10540 bytes
font_02_sfnt_off00010e41.bin
ab85fb74171f7917877b93c6d285de6a5a95e71c89bcb2b7b778c7e20466b81e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 18428 bytes