Malicious PDF — malware analysis report

Static analysis result for SHA-256 a044203dbc083aee…

MALICIOUS

PDF

94.6 KB Created: 2021-07-01 13:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 918d274e2fcb9603a2978f180457c4d3 SHA-1: 5dc76341643271a5eebd6a996616dd3d7d3a05fd SHA-256: a044203dbc083aeecf93d988c3fd2effa2d3a2e8fe0cccc8b40c293be34ff4a3
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. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The primary URL, 'https://irlanc.ru/uplcv?utm_term=a+brief+history+of+time+book+download', attempts to trick users into downloading a file by referencing a popular book title. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://irlanc.ru/uplcv?utm_term=a+brief+history+of+time+book+download PDF link annotation
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/4vmlk9dga6imvpl6etefjrp1q0/32909802159.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v8hen86ad5t58vi1rvlmjdudsa/11235091686.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15994efa6---55226914093.pdfIn PDF document text
    • https://argumentua.com/i/file/51436584506.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754734b1c10---21264008386.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/letalapulisemakivuxixapi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab9a4d6fa2---famedofib.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/828ff85c1c7dec66c26e4ce2bf9168b8/wudenugamizi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cf8497c0a---64725572976.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eefe54704f---xikejijixugetupobivos.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607301956d9d9---watob.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/9499856034.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/lenawetusof.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/5rggc7ibd778m20bsv67t0ugod/vejijufuweri.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a6945f6d088c24ace3db60429ff33212/zebivazukanipojafowa.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750a8078e8c---jizadutujaxulukemawem.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7b955e66---54168324290.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/23027359465.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/virifenado.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/psngld1qabmilj8vrkp04bkfj7/48780970315.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/5274a71a5337594d69860541b769e3d3/29731868081.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/7842141414.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ee6e376f---73705550592.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/bvqhc7nhjcirmbha3eev4onklt/lifizuzesad.pdfIn PDF document text
    • 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_off00010e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 17252 bytes
SHA-256: 048326891fb1d342511e74fe91f9df993c47b000dfc32360f93757f68ba3fbc7
font_02_sfnt_off00015361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15361 11032 bytes
SHA-256: 6201c85a7611d41ebaedf5f6885d8dae32e9cda8fbecd0dcc91300d1aa727485

Open this report in the interactive analyzer, or submit your own file for analysis.