Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16d3da6f7fa3afb…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 07:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: df754d52e70f1759c1272260a58b4126 SHA-1: c5f1bbcf59d834a301e0d95fdfd97427ed0e8463 SHA-256: a16d3da6f7fa3afbf4059d74a5f15f90f256f4f188f22fa52f8bb774412d7d01
196 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 contains numerous links to external websites, many of which are hosted on compromised WordPress uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=aprire+backup+whatsapp+su+pc PDF link annotation
    • https://distriparkbotlek.nl/userfiles/files/55203060229.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/kilevajigin.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/narenep.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f872e2eee7---gimunibutadu.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/toguverizedilewe.pdfIn PDF document text
    • http://videocycling.info/files/file/lavizodovaxujejox.pdfIn PDF document text
    • https://shevian.com/images/file/45833526851.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/xetifogepexuvosukepeziju.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/ropetalej.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/45293233003.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eda76607e---sevemozovi.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/xarugetipupegu.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/dobipizekigi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9fb1917d4---likab.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161406f86d4b7e---38481238903.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/83249658956.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/jadazedonivem.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/97281032628.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/xazasa.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/lalep.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/78416108735.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/jorexobaparemawutomiz.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/62637059321.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_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 10600 bytes
SHA-256: a14e1b8353c6d9343e8dac2181a7b2c31f6d6ecb8e0e8559bdeb1eb955b987d6
font_02_sfnt_off0001046e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046E 18060 bytes
SHA-256: 26f7cdf3ab1605cfbd1b631c65c273d39b61795230648e56bf24c0a9ed02773b

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