Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e36276549396a2…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 23:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75be20326db21091e8562946b1c8eea5 SHA-1: bb7d56e4dc27883c68977100b55fba93a3abdbe7 SHA-256: 05e36276549396a2ea72d6062e1c281088a1ac914638294b397ccb4417c296ba
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 CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and the nature of the URLs point towards an attempt to lure users to malicious 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://chcial.ru/uplcv?utm_term=aashiqui+2+movie+download PDF link annotation
    • http://aatmicscience.org/asuserfiles/file/jelorasajalarusibazoxi.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/xevususu.pdfIn PDF document text
    • http://exosushi.com/uploads/files/31753836889.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/rasibejafaken.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/vosuruwavorugega.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/xitevodogom.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/46407177662.pdfIn PDF document text
    • https://coil.hk/upload/files/11991933644.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130b209e24e5---solekujoxomeza.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/55598854743.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/nutogukazefedan.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/xurozilaxeme.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/fisivenazibebamusunomowe.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f03a169789---gosexe.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/13260800093.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/walunowesuguj.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/kipofinifotalawulowuwi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139082aac689---95644267757.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/22452450069.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/kepitenimomubadevo.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tumegufinewevurebo.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210914_3CC169FBC9687B2C.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/wedobiloxusixixorun.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/10508505495.pdfIn PDF document text
    • http://firegallery.ru/img/upload/jijuxutokazelufitowomosav.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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 17728 bytes
SHA-256: a81c9aa740d399c06848868c1e4d933be431c0fe47154f27366cae8ea3db14fe
font_01_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 10816 bytes
SHA-256: 86002dd1de26f595b582e7041b66889942c540eb00925a72e3faee648c285a79
font_02_sfnt_off00013316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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