Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87b4272c60732a8…

MALICIOUS

PDF

96.0 KB Created: 2021-08-01 21:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a1b83206fa3caa6e07a8f083477ad78 SHA-1: 2e325683daabde08c4317717c7f1659336948988 SHA-256: b87b4272c60732a86114cc0e49cef92ffc560d74b3191dcce2475b7daaa278b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting an intent to redirect users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://crysiq.ru/uplcv?utm_term=les+registres+de+langue+exercices+corrig%C3%A9s+cm1
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45ec073c8---fegulokubexonov.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160802462d9d2d---70035366895.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fd9827a67---23918750309.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/206b96511b745440758e164acc917853/novumulafu.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/3198f5b64f119a8bce7544b9dd000df9/xamenamipeb.pdf
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hsseu6jk7pnuvncssmh4h6h0o4/pudanotisizukubu.pdf
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/mikekuzarenez.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ff9084f---gilusepufebodi.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27852106b7---ragelo.pdf
    • http://scpt.it/userfiles/files/tugomojomasusude.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4a7e5e7f---15298880242.pdf
    • http://worthingtonpark101.com/userimages/tovizopowumu.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdfe3c5536---piliripebeb.pdf
    • http://sherylrobphotos.com/clients/56056/File/ninaxobajidurujusadisiz.pdf
    • https://jdrum-music.com/uploads/ckfiles/files/82497798715.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e4a73be13---76100264811.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ab44edd2be01f6b01a6beddc1514b96b/64830033357.pdf
    • https://dansobentre.net/uploads/file/tikobikisu.pdf
    • https://kfmaccounting.com/webroot/img/content/files/datop.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/76de496fd25a0f9d862af4e7f95ff10a/sokuwu.pdf
    • http://namlongprojects.com/images/uploads/files/senokorejuxo.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b929122d545---4678189471.pdf
    • https://astek-telem.fr/userfiles/file/vewasumebofodebup.pdf
    • http://automsystem.com/UploadFile/file/20210722223830038.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_off00010b0c.bin
0f3abc33941ac0f1883736c55e9f01b7da5449198be257b995a4ee797f87c46b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 11080 bytes
font_01_sfnt_off0001246d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16792 bytes
font_02_sfnt_off00013c7f.bin
1efa5b34716a33429c04d2c7a30548b85f1bd472500dd3becbdab49eaa3eff82
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7F 20156 bytes