Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa29d46992316952…

MALICIOUS

PDF

96.7 KB Created: 2021-08-03 13:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42e3846c0d6b62651c5f3da39085541c SHA-1: be6e1d88ded1ffa5a23bab36ecadf3f94bced867 SHA-256: aa29d46992316952f3dbd18cf9d06c85e5bd2de1d559e4f875c74352740f4352
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URLs and the nature of the hosting suggest an attempt to exploit users via indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://inwebjor.ru/uplcv?utm_term=timothy+sykes+penny+stock+book+pdf PDF link annotation
    • http://carlaschroyen.com/content_docs/gutovokamulagu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e64ae1b25b---bamumabaku.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/76210180499.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/810cd0af59a65686199d14aef739fc8a/tudutumon.pdfIn PDF document text
    • https://codecs.roimages/file/pokewopowo.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/jukupawubaxoret.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/e1p6nv5s5b8u72i8aqt3frsoru/zefeb.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/e7d4175c9cc42ffd177ce9c2236b4862/xatemitobapofaxup.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0bdc0be2f---mutasalab.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fe8f7d589---rudagalopijojelakujosukom.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/25398429970.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3c480135d---getupoxavolozutowugugeg.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/nuvelewanosazeviref.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608edd01d7812---babok.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a423b1015e6---metosesosidaf.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/jirazejisabolito.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c8829f76635---seluwelitutifutelevevafar.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ccbbfc0f8e0de2bf57843de9a60fa15c/fatejipojebonufowenog.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607869090e3cc---wakepodomubitef.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3af110754---vuxadujatisamapexazigege.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c623b83d258d67c4a183e318c22c7882/71721847961.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075ce0a3d171---rekakedodot.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/97374503119.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/47255372817.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xenedepurabesom.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/746c6b6e6d4c45006b3ab5665c50b87a/30084375907.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_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 17888 bytes
SHA-256: 9a430a0d0901bf0644f3fc4ad26a3ea89eea8293f5b3f6859fc188ea4c8fa1ec
font_01_sfnt_off0001428c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428C 10888 bytes
SHA-256: 3fc4271cb437c9879634c0eee0688ec79246ace0902cb96207cd116ad818ef2e
font_02_sfnt_off00015b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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