Malicious PDF — malware analysis report

Static analysis result for SHA-256 b296186dfd4c848c…

MALICIOUS

PDF

88.3 KB Created: 2021-08-01 10:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70e986d6a8dc6e605c6e12e3c45a29ec SHA-1: c4a23ac06299ef0853624e6a7c15ab4fd2cb2d3e SHA-256: b296186dfd4c848cf27d7a5e0d2613a9a9c5143e0d353d0058fe59d707dd8227
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://sns.hu/_user/file/68209498112.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f06ecd372---kudufevegakitu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c6baa7de2---10658256165.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/rgrngru19dj3m0bvjfj57f2app/94987231638.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/samewa.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76072c7fd---93305206861.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/07747ae066772e7da0ee879c2038676c/fumixaxufivam.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/wafefibodugixigabazilut.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/3gde2lbmt858citpg3a7odvpe1/78102478433.pdfIn PDF document text
    • http://debden.org/userfiles/file/15912751816.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/82728210693.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/75510061114.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/b8b9334e7d8540490488062d2435f887/rikowufaxevoxow.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16081e63465a8d---karuguf.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/9524932354.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/puvodezedovokozeleretamot.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe3246091---gevalizeveb.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a918d915640---45124670917.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4a67f350---12957617200.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076943fcbe8d---jogutenogupadonurisonu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/aepg2rp3jd9g5fcfr1kcea2ub3/nilizoteluk.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b735acadc55aef46e897095a36e08737/vugibuvegufeladekakur.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/96135169266.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/60010744642.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/60385954653.pdfIn PDF document text
    • https://coluer.ir/documents/file/35669155423.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/26497316467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=%C3%A3+%C3%A1lgebra+de+baldor+libro+completoPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 17376 bytes
SHA-256: 1fec31b43fe4a2a52c9d3becacb90c0c96cf6edecf8f88e373280e3440b6dc36
font_01_sfnt_off00012084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001389b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389B 10996 bytes
SHA-256: c94fd0d2d68d94692a1972e1b0b3b619657d9cd61cbc39416f762ef0f891e4f3