Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b6dbfc2d9d451a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 06:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 08b798a95d8ca3eb0e9bdb517fed58fa SHA-1: 08ef0e3cfdfb0cfa2a134021929002dcf98fc59f SHA-256: 86b6dbfc2d9d451abfa90cea799f46717756e4b7b192b075b7b50e8ca8518de4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or serves as a phishing lure. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. No scripts were extracted, but the presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160909d6127934---wuzulefaxilomoremu.pdf In PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/ziwavivazirode.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/valatosebak.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613100bdcfe0c---wabizomori.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161254d1344604---pitivamuvamadapiw.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/9342809596.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/c47d92pi8lh8f25e6qokkk9dk5/19901127446.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/xagulapujudedukoresimu.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/8256370743.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f8c0b4c2---tevovetedevenaxutak.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/zagugijegofovija.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/pikobozaguta.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a3474d840---65575876282.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc33068dd73---54762093815.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21cd2e64cd759d0a752e4a714f327d61/fipugadazesubax.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/vajiribitigubepiwavos.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/mojuvuvokobajenari.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/53876987740.pdfIn PDF document text
    • http://belv.ru/userfiles/file/vedimegomosegatubuji.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/16e236f564bb3d57e4010ffb2baa19ac/vixuletodotexo.pdfIn PDF document text
    • http://hygradeinsulators.com/images/uploads/file/30545271597.pdfIn PDF document text
    • http://honda-vo.com/upload/file/41274413460.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/91111075251.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161159cf398945---rukisinilaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=1st+world+war+and+2nd+world+war+pdfPDF 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_off0000cb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB64 17200 bytes
SHA-256: 9bd179a6e138f03ae3d6b0abf00657cd5f58fe3bd3fb786cb30debd3f207e036
font_01_sfnt_off0000f759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F70 10428 bytes
SHA-256: 72ee5037295cc1e39641bb3730b12f1409f088c920c414aa2641a96490df126b

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