Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0981cc08771b5b…

MALICIOUS

PDF

87.1 KB Created: 2021-08-06 00:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3383ceae9df61f7dc37c0134d6b53cd5 SHA-1: 1c77101cac8a58572ebef9ac1bac5dc9668ff24b SHA-256: 0a0981cc08771b5b31a977316c0724e2172f9603b3f796eb3c92c0c8de844675
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish for credentials. The presence of external URIs and a QR code lure further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://tizianaiberti.it/userfiles/files/24077094795.pdf
    • https://arab-hams.com/Ups/files/watizevomunidewajo.pdf
    • http://gibisch.org/files/files/lituseram.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/54fc8d961853dfff5e324ec914d3250f/65447936792.pdf
    • http://shepardinteriordesign.com/rw/upload/file/xevamutelibudizonibuj.pdf
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/28085820151.pdf
    • https://kasihpaham.com/contents//files/mazariwodijagef.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/932a7d5638e0c91b135c5b6fbc742be4/vedexowito.pdf
    • http://camwater.org/media/files/zudemigavukilozuvexuj.pdf
    • http://kledingindex.nl/images/uploads/paxatesigama.pdf
    • https://mimpiindah1.com/contents//files/51688190388.pdf
    • http://hglobaltour.com/FileData/ckfinder/files/20210608_082F9856788CA35F.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160783ce483d9f---30992951830.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/pehvhc51ffjevuhjsqlo5po483/vifuladugewaweputixasu.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160f1aed32dfea---58782458720.pdf
    • https://brahmagnanam.org/fck_uploads/file/pogebebuw.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb947532a---33180873443.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdf42a39b---tejurutinokusefud.pdf
    • http://www.amedna.com/userfiles/files/pedelap.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/udan6g3sho2eqoap7md4lempfn/69207849211.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a888252f17d---38166203867.pdf
    • http://optykglowacki.pl/obrazki/files/tireburipu.pdf
    • http://selfmadefilms.nl/userfiles/files/43783480504.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/d060ldj35guooamoud7sv7ll0q/85550329324.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+offline+game+for+android+under+50+mb
    • 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_off0000ee25.bin
4c8ebf2ceefb52f7c15d6818f34848c1285b8f3470afa96863bb8efd62f45fba
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE25 11248 bytes
font_01_sfnt_off00010854.bin
30fb5cdc3fc880704c533697133842faa5110550f7448cc41d7e0f46e4ff7d9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 17008 bytes
font_02_sfnt_off000134d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 16792 bytes