Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffff8ed5c375dca2…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 11:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 51b7eceba5cd285e49dd737084587d53 SHA-1: 8f8b3ee1f287ffbfdb6b9bff995f2fa8e53840f3 SHA-256: ffff8ed5c375dca23050ab906e3ba5e3641e6e009a8436fc70fe01e43ae1a4f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://360global.ca/userfiles/file/xabusudogudowogijozawifa.pdf In PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/68800012047.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4c0976a534e98098ed580bda44cca26a/laminopulezelabeperonide.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4f0af28a---womirosoluzemapazuxow.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/vasoledizow.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/pivolujefinekoguve.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/bakixitor.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/1483838814613882b090af1.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/93852049065.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613827c0c51a7---6520153145.pdfIn PDF document text
    • http://liluby.com/upload/file/15441369007.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb5b43e279---bumikupurexumojuxim.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/72036843706.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/sufuvelesegaka.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210904065303.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/45530231597.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/pizijusuvufev.pdfIn PDF document text
    • https://heureka-cz.eu/files/zufepanetajigesebibelugom.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/panakusipefikavalib.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/zojesuxabokina.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf106dd23---lemotasulugivodinivelox.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/nekogojuzulezinamuzegiw.pdfIn PDF document text
    • http://pbpharm.com/upload/files/73463293681.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca97eaefc---47737335921.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/vedunuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=fortnite+best+battle+passPDF 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_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10953 18036 bytes
SHA-256: ab0d32f40d4644435597bd1fda756feac680523ecdd536cba499bb8bd67dccbe
font_02_sfnt_off00013895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13895 10364 bytes
SHA-256: 213b6183f98ec93909085973809faf6d41e896df489e3c714bdb1a795a2e1ea1

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