Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad7e70322dd139c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-06 12:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e70432423d47e6199ddeef616ff2733 SHA-1: 421644500d549d64d3dd5e7bf1091b6a16242deb SHA-256: 1ad7e70322dd139c8149c0a19474aefc219f5ed55e103dec6f52d73b3d829f8c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which are associated with compromised CMS uploads or disposable hosting. The presence of multiple external links suggests an attempt to redirect users to malicious sites or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://budka39.ru/files/39598664745.pdf In PDF document text
    • https://hgb.se/filer/file/wasapitebiredesiboruse.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/pamadugapojex.pdfIn PDF document text
    • http://jump360.co/upload/files/20210813172930.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/gubadowosagofadubaloliv.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/tugurag.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/gaxulilatokata.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/17238881056.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/revodujotorisi.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/05ol9mnvt7933fs6sv4iif4k74/60447655493.pdfIn PDF document text
    • http://immopolignano.lu/images/59569667604.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/zatewig.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/44299015621.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/95361856675.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/xamizuteka.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/nesewanifafibiropidag.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/59797316192.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/ronewuwogeja.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q562b8jv6fhmjhhm496qt64op8/lemesurati.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/84920463495.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d31afd2c9b---jobilirixobulijosedi.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a44fa0334---32064343260.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d24dc58538---jetaterubinajozobebi.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d0dbcec1---93879053654.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/37759125133.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/pigerewexesedasuwas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+pilates+suspension+method+book+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_off0000c9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BC 18120 bytes
SHA-256: 010717efc11d1f41b653e92bd9dee10459e348f3959b40f2da56419ae11aa854
font_01_sfnt_off0000f920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11137 10956 bytes
SHA-256: a63e5e292acdc12e9fca63bd94c29a40ff7a286a2e97038507c1fe9ba85411cd

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