Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae45f0a72c050f28…

MALICIOUS

PDF

91.4 KB Created: 2021-07-05 00:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d24ca336ec0effc5003b1fc93a1159a SHA-1: 2cb795f3ec93d8d86df343ad9c83e8fdf8604394 SHA-256: ae45f0a72c050f288c6d67c547989d8f600c9c468df1365414d47df4723c9109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=ds3+dancer+of+the+boreal+valley
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/14632663210.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a070956ef52---32011033443.pdf
    • https://auditorescr.com/ckfinder/userfiles/files/zijeworevuvife.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/ecbc72fedd445f07800ac27c2bcdcc91/risuvebegij.pdf
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/midavupazajovapaxojepe.pdf
    • http://saokienviet.com/uploads/image/files/rorimevopemedopureledar.pdf
    • http://billsky.ee/files/file/vuzetozekevagak.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/e5956b100753de898eb240760c12cc18/gowaz.pdf
    • https://beautyreviveshop.com/newerac2c/userfiles/file/90070777278.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/icpn1t670ujqhdtt3fcjc387m6/buvaloxizatugisupaduloju.pdf
    • https://ctsgroups.asia/images/file/46290981387.pdf
    • http://pomocnaukowa.net/Upload/file/47444655374.pdf
    • http://lafayetteconnections.com/clients/52818/File/dopototiz.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920b6e461d3---xukuvuxoraruganu.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729d6a2dff1---vixitez.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c79946a8798---21618374177.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/40656215354.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f7e2d028---43825315830.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2eed4d7631e68c66a971c1e8dbcfc518/novemevujixijunim.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd768edaf1---93138421240.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/zosafuvez.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088979f3234f---80469404385.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qv4fi6026auv8m09624jv7lou2/40187107299.pdf
    • http://belst.by/upload/file/57415081830.pdf
    • 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_off0001023a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 16792 bytes
font_01_sfnt_off00011a4c.bin
9ee2babffc198301fe9eb1f7bdae0c0244d0502c3dc167fdcc1ff28a01bb16c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4C 17076 bytes
font_02_sfnt_off000146ca.bin
7eaa510020bb1b2e8edd620d722f8108b3315d703331a689e677477e02e54d5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x146CA 10972 bytes