Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a323a9f8bf1667b…

MALICIOUS

PDF

80.3 KB Created: 2021-08-21 23:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5845cab71e0cc1847f0cee2fe591acda SHA-1: 6f56346c695c8ad263331023e0fd61a11c251da8 SHA-256: 5a323a9f8bf1667bdb49de45f318bd188b65c92dc8ab457f74c4838abed634b4
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI links, a link farm pointing to compromised CMS uploads, and a high ML classifier score. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of a visual download button lure suggests a phishing or social engineering tactic to trick the user into downloading a payload. The numerous external links, many pointing to potentially compromised or disposable hosting, further support this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=download+zambian+roman+catholic+songs+mp3 PDF link annotation
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/1596347337.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/356002093.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/goninok.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/60753870735.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b27607cc5---mevexiwi.pdfIn PDF document text
    • http://ymmicro.com/files/files/bipadiwimivakaduz.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/kefutodevabigugo.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/lupuzaruzefuku.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/756772975.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/s6gp0gsbct482oqm3ao0d59bd4/53026150587.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ab0c57c0f---najavewizuvutaxulubexozev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc804829be0---92077887566.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4e6104c1c5038f64ad936a286fa35f25/72437165430.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/goxoxuv.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/62446842854.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/butatipajupajazepexoxotep.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb20a5415a---58217132464.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ffb3960e0---riribosudolepak.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/82528553589.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/55967200618.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/83749465991.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/21510244312.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB52 11288 bytes
SHA-256: d2f5818de401abd5019e6f5e64006558bf6e0fb3fed59526e793063b4778fa45
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 18824 bytes
SHA-256: 910d9fb82b6b6d6a7a23368f7675e586b1124ed20e72e03acbd2ebc2fc9b413c

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