Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ec937686521eb6…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 23:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80788d852a2c37cbb334f123ef612eb3 SHA-1: b27a3a38ba934987242f4ca68624695e535f55b3 SHA-256: 70ec937686521eb64ffd6fbb273b320fb193e8bda83b09e98c3fb042e287a735
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The presence of multiple external URIs and link farm heuristics strongly suggests a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://chcial.ru/uplcv?utm_term=lakeview+assisted+living
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/8mi54sh4a5q62gu8698hf9rj72/59813183670.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a331baa02b---55831774221.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d756dc6c60c95adafb7a5de825b34166/tifinepowifijexuzofezi.pdf
    • http://lavalnerina.it/userfiles/file/bevagasogegoxe.pdf
    • https://amrapalispot.com/userfiles/file/pumilepeburilotetobi.pdf
    • http://nadiadsa.org/userfiles/file/xesixibar.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/79f1ce85a6c9125fa316248a644af793/70173883488.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9ed594e0e---54300268174.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb20a1dae---41008158278.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921b0500876---lovumexevade.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/9mpjtl5q14f0viutl317jl08sg/sumeju.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748032d9a95---lepatoropadusagukebegolaj.pdf
    • http://fgosvo.ru/files/files/61055008560.pdf
    • http://al-bandak.com/userfiles/file/xafagenapene.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d109b9c1---38666042124.pdf
    • http://backkwang.com/userData/board/file/72310622333.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f418546339---83995719724.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083172d832c2---witiforewan.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ea4bea55d1a5d0131b8c4269937414aa/77887967235.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/78a18c81661b5076f2befc13dfe6f1fc/46301362678.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6191e0be---vuwovemozuto.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/6je5tkmj39pfvfvnt2tlkream5/22789269225.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/dinok.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_off0000ef01.bin
930cf7a24773ce40088b3c98153d6dd1cceade8287c850ee9eb246ba46e575ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10404 bytes
font_01_sfnt_off00010688.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10688 16792 bytes
font_02_sfnt_off00011e9a.bin
03f4b011c4f73c7247db8ee19c4a6203c53316131576c1af2061e5a1d38a8b2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9A 16836 bytes