Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d9eddc8bec148ae…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 04:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a86f7e70228162be7e135bf6f8086908 SHA-1: 8790265111557e901d3817b7741dcd4b3de3beeb SHA-256: 1d9eddc8bec148ae7b8493599e762ddb1a507fd4bb78a702b4a829a24708d6f7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting, likely to distribute further malicious content or phish for information. The presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to untrusted sites.

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://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/1e12eb9599867706ff15c2c2e8d0a3e8/45156407313.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee95cc1c21---98348111473.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8230c576---69450450877.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/88790570245.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/9624121143.pdf
    • https://glbtrader.com/userfiles/file/gokaboku.pdf
    • http://spamsmsgiare.com/media/ftp/file/nupogig.pdf
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/kadijefitoja.pdf
    • https://hunghiephuylog.com/upload/files/gofojar.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/57836542544.pdf
    • https://bbmint.com/userfiles/file/buzofere.pdf
    • https://makojudo.pl/zdjecia/fck/file/4848838132.pdf
    • http://hrdiborice.cz/erucom1/files/files/71621808832.pdf
    • http://aceonlinementors.com/userfiles/file/27274866824.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611792c3ccd8e---rasiziwowazeremadevixife.pdf
    • https://nepalonetours.com/userfiles/files/17216250660.pdf
    • http://ausafe.net/images/art/files/tewofal.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9061b8f742a7ae3f20726130ac6836f9/vejaxozomafod.pdf
    • http://adabaskimerkezi.com/upload/file/3331114885.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/rqq18v1al3sd4of14qs6a5kbvc/vopejejuxa.pdf
    • http://ciccioinpentola.com/userfiles/files/wajinepilowiwododevema.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dee91dbd064---jenevivejofavipimisijo.pdf
    • http://holdemigny.fr/ckfinder/userfiles/files/tomodikewomatu.pdf
    • https://robert-zauer.cz/userfiles/file/sozakibinivubosul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pile+foundation+analysis+and+design+poulos+pdf
    • 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_off0000cb15.bin
88148038aa03bcf41e6b229c599251f5cc6bc3a0bd71575ae74f64ecf1331cf1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB15 10788 bytes
font_01_sfnt_off0000e3d8.bin
212fb1fd877082de3caa180a60c0c110cde72aa74028318f710c92e7aaaea074
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 18672 bytes
font_02_sfnt_off0001155f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes