Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c88551646d17bc…

MALICIOUS

PDF

90.1 KB Created: 2021-07-27 03:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9957f32a55f18719b8b955958f02b2ac SHA-1: ac3996ec5bbd1fa8c904436eee0e7b14c300a3ec SHA-256: 43c88551646d17bccc18b3fd2cd099e750c589c735feb5948e160e3c006ec46d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or SEO-based malicious distribution strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://seerupit.dk/assens/file/refetikop.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f94adeb73---kejidodijojimu.pdfIn PDF document text
    • http://yejida.com/userfiles/file/90970698995.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/65534043997.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/fujosupi.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/wuwob.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/cd652f12cd80a1c349f6dc2e375a737b/lezosebajodinosidodoku.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82101023054.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5f99807c7dbe07894b46913f5f311e15/sabizapebutozure.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0fa8e4670---31875493693.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f066bdf457---nilodivaxixarusutafemov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd47165be---jotamivagumenu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ggame5q8q5ft59mv8ldaa3iki0/zenadotitigiduviku.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/dubajunatanomulejodipu.pdfIn PDF document text
    • http://plncse.hu/php_data/file/gavumuz.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/8q5ds32pj1ijap4deej8o43a32/41918925757.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6705d9976---38337730964.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/nomujerezitim.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/92076811422.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/88c416e5508533e37c560f06e7e8a141/podowowijapux.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/431e7ef50b043055d6043d4b89724849/95360876491.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/38741231079.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb2541027---26103817891.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a842442ad---79283004946.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e230cb8d8---50651689985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sims+mobile+hack+without+human+verificationPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 11160 bytes
SHA-256: cbe6c3e485bfbd32e2c1e063cfa486b8250c3122da3206edd06e1d9c923721d1
font_02_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 3236 bytes
SHA-256: 2c99b4baceba90585be74970730285f87490cd0ce79538c02c38e13650473c2d
font_03_sfnt_off00011474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 18360 bytes
SHA-256: 8856e1be4692c606bb0d7eeb2d59ba63c579547ec89cf334bab01c24c1f11d9e
font_04_sfnt_off0001435a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435A 16060 bytes
SHA-256: 64af0185a2beffa7382febdf957b2ddd2015d3985e5bc97cf8ad64f3c2914973

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