Malicious PDF — malware analysis report

Static analysis result for SHA-256 0150abc0d1fd3cf6…

MALICIOUS

PDF

149.6 KB Created: 2021-07-13 10:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 72776b45d0a37d702e2349b3bb644ce4 SHA-1: 39b65bbcb51217453e9fd8d879bafb215ea5b5ec SHA-256: 0150abc0d1fd3cf65cc7227e420d83eab88dcb3e72751af81d52e822f29655a6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=class+12+computer+science+c%2B%2B+book+pdf+download PDF link annotation
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609854c46b17c---20183776575.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091a9e6c1637---10349604772.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21b396504---ripukelebuxixipejobolu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075cce670c5b---bidunivelopajigumanuz.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/s3vusplc5s8v40kkcqq5p70fje/pegowedukusafosuxum.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/noxoku.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/nutuvo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9b212462---vokegolobepedosimemun.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbee5a732c1---52844128933.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5ad3c6551---winurololujibo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089714b55e8d---sorevimepi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607835af505f9---lelefe.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/33d94253a1e357a01b858d83de14c366/vogopipoweramobiw.pdfIn PDF document text
    • http://turatabor.hu/media/wezapisebosega.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098f5c99f6ea---42287319496.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/k76s8fdorlpt5cs24trks7579p/99205603082.pdfIn PDF document text
    • http://dgjst.com/upfile/file/97767726272.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/sagatexu.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/73442957020.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/33071546055.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775133d28a4---guzolelesomakud.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/sewadutebikisekuwex.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C935 21220 bytes
SHA-256: bc25b40b32f16f2ca30afdabb3f2bf4e0f20f7bf3575d748bc475d509496d33b
font_01_sfnt_off00020096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20096 11400 bytes
SHA-256: 336634d7c9b1a4f65d4fa7d16dff788d71d482649eea3f701b8e2094110f5b31
font_02_sfnt_off00021b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B65 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29
font_03_sfnt_off000230fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x230FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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