Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc05ee48f2bee5b…

MALICIOUS

PDF

94.8 KB Created: 2021-07-04 15:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 154878b45bc21c18b83e6b946ba5fcd7 SHA-1: 1b99794659a8eefeca3c152da947e3227f5a2ac8 SHA-256: 7bc05ee48f2bee5ba15249ceae6fe5e99671fdae9a67936a59dcd3a778900d95
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing secondary payloads. The presence of multiple compromised CMS upload links suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2nlc21iq57ocnish36j1suhmt6/25982357459.pdf In PDF document text
    • http://jrmhandling.nl/upload/file/nitobaxotopeper.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160739fcf2472f---52541070062.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607938e18072a---wixemimibeluw.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/153ab6a63fb10361bac83e416e9ad58d/baxiziwodelonal.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/bogukivisamipipodimoxiwi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f52a6c2e83---90939534645.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c073642d63f---84458921716.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba07e18ef---71761151154.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/fukuboxewu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7182b0718979c0f33ef521c6c7cef907/17863222069.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/g99dkguspv2ivndifisotdflf4/bonajufap.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b00382bc---xubijigi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607129bc6fb97---30139276183.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/kanuvabi.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/80212351753.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c80c4c938171c8203b3304512e2268f5/fitofevikosepadona.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7lg00p51p0sb8tavufe4tqk771/dodexit.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/da73bff4f22f2bd0bd221ad2ee9f432e/41597278171.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/92472530069.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ulqpbtd0kjkdal1jvb21oqpj52/85476051552.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aab1c9f486---72461690948.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/38685360801.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cd4568e4e66276634ae8cd2017af1ebc/35606417278.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/c43909faff3474f3d2a205046db7a5b8/41990906935.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/15978821473.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/a29otg6936mospssdi92enp65u/86720308757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+you+become+asymptomaticPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE2 16308 bytes
SHA-256: 056c635445ae957760832ad9ce81bbca3f4175d3b80c9769c6e0874bf6aba3e0
font_02_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 17392 bytes
SHA-256: fe0bbb7c9d7ac43bec2b12c1a5542c195cf94ec12e09f07837a972f3eeeccb7e
font_03_sfnt_off000152ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152AD 10856 bytes
SHA-256: 6d73d6edd93761d2c4b2f0e2a1e908339e75c722c380fa767d4bbfae51a858ab

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