Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ff2b44c6d3d633…

MALICIOUS

PDF

105.5 KB Created: 2021-07-21 14:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5f5b224f47de90c57755cd5db507ca6 SHA-1: f066c479882ddb1258871ef9c5693de1047532d6 SHA-256: f8ff2b44c6d3d633f75b9f32bdcebb741f5d7e9663f7ea0a237c7933a1107b22
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070ecd9c3685---wakeg.pdf In PDF document text
    • http://blatt-gruen.ch/files/gosefeko.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/xirememavavesani.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097f211b89a1---xavoxap.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7ef896a4---9696726480.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160866973e102b---90985494387.pdfIn PDF document text
    • http://www.asslar.de/downloads/96055625983.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/58543436118.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/300014074.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609148f45a4f6---nekus.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/37973864561.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606cb330e5248---tajufavuzeg.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/kq3vpkr564okad0e6k2tcpg8eg/zawoxikebizex.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/51489803490.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16089a0b517725---29916307196.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/ltmcqlm0jfb7kd5td0bmsk8v6l/daradijemetanoxituzoda.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/sitepazodobo.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210624/file/44520478809.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b8c9c966---69469436086.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/39981902973.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/t94ucga5p215gkjpjjbvvncrk7/53907629878.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/xarumivobomifitafudelami.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210629105225.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4e181eb4---73917104232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tale+of+the+nine+tailed+fox+2020PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11716 16288 bytes
SHA-256: 1cf5ed78cfd0d3bcabe8b386f5c87ef6c5f47f04144d609ffb6518c1ab8d0a46
font_01_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 10492 bytes
SHA-256: 19242de3c395c781fc671885a4fe1f45255ace8a685b72cee22933d51d7c4e71
font_02_sfnt_off00014515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14515 18064 bytes
SHA-256: e77179970236184233a4deec3de1249a325f36ad23f9f3b55b1ada774dbe8c64
font_03_sfnt_off000174aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CB7 2516 bytes
SHA-256: 3edeb7f410febbb69d7e4b3eac154a026160b08d77fb294b8461eed2cb528ee5

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