Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ac89508e9f381af…

MALICIOUS

PDF

117.3 KB Created: 2021-06-28 16:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6027da157f1241ad231787f206b63a0d SHA-1: 7dfea493b0916717b955befbedfc7151c7c78188 SHA-256: 2ac89508e9f381af82896c89c91d4a1b0178237f571d274431b73db46560d202
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its specific content, but the heuristic firings strongly indicate a malicious intent to host or link to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc8c9d754d---kaxag.pdf In PDF document text
    • http://lubrifianti-auto.ro/files/file/fekeluwa.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/mk4n0jha9uoh5ime6mobb3spig/zukujisivezupunaderiri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f01e5df391---duviwebalijo.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jubijetebelepopusojowa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160baccca01fdc---80647344236.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/2254893837.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210508/file/88452060934.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/90b6485e00e9a7fd40054bf980c81df1/55938709346.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/20f9239492e1b18723604616dbac9235/52399440973.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/14f4240cd504885a401880854a2c94dd/tumogazezaguruvixaxod.pdfIn PDF document text
    • http://stattus.com/assets/file/93118308280.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/82f4c7079a3256de196f463e06c2bf10/82245650646.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/usbsmosgbh4k03huc9t4loe15r/78925464503.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/51066275762.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bfcbf2d4a4c---bibozililepejoso.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ebfa89e1d524d01832494fc13fd96eaa/sedakidu.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/89f2a252459a6b54fa6e2d91b72ec61b/wilepidirofilo.pdfIn PDF document text
    • https://invest.pl/userfiles/file/bapetesowegexapagazubepun.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/9890esj1n7tspfi22qivu3d002/pakinanizuliwawita.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/80749470115.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/taliv.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/dbddabea94f5abfa804e26a32c68a64f/60315269317.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/bcfc5229edad3a0ba89ee8ab9a8081ec/3852840025.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0d81ccbe4---gemil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=electromagnetic+waves+that+humans+cannot+see+with+longer+just+larger+than+red+visible+light+arePDF 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_off00016025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16025 18824 bytes
SHA-256: a02b3f25203dda09555a13267fed8257a570d39ff45be8b70815a45d7e3f5ac8
font_01_sfnt_off000191fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001aa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA11 11324 bytes
SHA-256: 80fc866f2e601ea29b6381060a9d16220443ee520e032977b8c2abdb5c36b740

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