Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4a81cf1bd71afb…

MALICIOUS

PDF

85.6 KB Created: 2021-09-05 01:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca293471a2ba956a44e6df9573653547 SHA-1: 8af04c1e759b1329385b89f532d1041bb1752da7 SHA-256: 2a4a81cf1bd71afbadd805c63b8ef8b067fe8d23537abba56c816baee11e83ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The document's structure suggests it functions as a link farm, likely intended to lure users to malicious sites for phishing or malware downloads. No scripts were extracted, but the presence of numerous external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=interview+questions+on+algorithms+and+data+structures+pdf PDF link annotation
    • http://goldenpeak.it/userfiles/files/36202846149.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/77294488766.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/rolegoregubuxepovuxavi.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/ziteforexudojokuvurogov.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609763c808bfe---juxisulujalazodebegozor.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210727061348.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/2g36fl93lu23rr6oc97elgpuhs/xusezosovovesewagikat.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/bewemedolawejogut.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/lilosikeragunubijokopex.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/51228470554.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/79176943272.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/c81b15785295738451e968375b3d50bb/47078120817.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/45754836787.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ddf7d830---molumugixazesoperemiwuv.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/19053799050.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160906a7c0f29d---gibugekisobu.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6b2865f662a7091ec671523a6097e089/66059993413.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/398d1ffac7b166e5728c1256b0ae1b53/gemuse.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c62062d5a0---mopupegiren.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/66033713095.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd17676e3cf---15974595632.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2d04664370---55446827366.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/wokalotovunamanerunuw.pdfIn PDF document text
    • http://keramann.ru/uploads/files/69133015263.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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 11416 bytes
SHA-256: ad078e58428fc2f21859f21bdd5b963339d5ae94cbd53d742d0b7d67561d0ff1
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 17592 bytes
SHA-256: 2fbdbd180a9c9337fb931b58f23800aaba031bce2abcbc8c186b30267fcbb72a
font_02_sfnt_off0001303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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