Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bfafedf4bfd61d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 03:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 88681e5c070039ae70e5a83c6f89eec2 SHA-1: 439f477392e6597924e6d9f6b276e9c5308f9faf SHA-256: 81bfafedf4bfd61da65c5be33c3c7979578aa842c048b02baf90982b4d913917
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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=new+imoba+app PDF link annotation
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/3538172198.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f55d25db9c---jazukabig.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/gomefutipomevamupukixa.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2142bf9d---zevixu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p7brkdse2aaotb81dqfsjnjetf/68152690380.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/53495175071.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/53864485638.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/93560403035.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/66345740995.pdfIn PDF document text
    • https://theurbanthinktank.com/files/jiriwux.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/37819574273.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/nibafumonukogilarasukazo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/6e8ac0290993ee9260f55905f2ffcd3e/60783548793.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/64ab52bce940d2ed3115c162559ade03/2074516447.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/27656036959.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c652edb6db---mukulenunumowevilurevuf.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/j9ho5ivhrh62so8m1blpc5s2l0/20994901147.pdfIn PDF document text
    • http://i-physiology.ru/upload/jenebepebesekogav.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/42179597702.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/zesuwifigumur.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/ripojimuzovesu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161413bee354a2---95071623393.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/labajule.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7473eb51cf0f121541dcb04764f3fc2f/37628485318.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/jidisowinabe.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/loruxadubigijuwi.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/fazenawupupiwani.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/862520962.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_off0000e30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30B 17596 bytes
SHA-256: 5a33c850680998857f97df2db8ab895d9b180a49ce9749974d3e8d57295b1798
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 10100 bytes
SHA-256: 736076bc0be94827b62e49793336b64eac044f5aaa3ff7098d68f4d967c16d3c
font_02_sfnt_off000126cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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