Malicious PDF — malware analysis report

Static analysis result for SHA-256 03043a8bba49c485…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 19:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f5a03a38d6bd91ba92ef0634c169380a SHA-1: a3e1ca0c29f6ca3db5fe414b04f6e4b6f9cccc94 SHA-256: 03043a8bba49c48584689bb054bc73d9487a78c768f162ca6d7900625f232901
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of a malformed exploit stream and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://philabc.ru/uplcv?utm_term=types+of+sliding+scale+insulin PDF link annotation
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c4669a48---97401179678.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/30468659243.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/49204905717.pdfIn PDF document text
    • http://www.infos-lentilles-de-contact.com/images-sites/files/68490101725.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/25181554164.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/fitadimobajar.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/30565656145.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/33308406367.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a36bc6381b86e1f15c73ab55e3804933/sexeboxuvalakorep.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/repelibutuwalewemiso.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/pimuf.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/jopumikivuvaguji.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1b82db8e5bdb3ad9360206f8d6de05cf/8406040124.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/welopasuwewinejez.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/5bb0b8e24d43ecf5af096f43f1c2c633/80824751121.pdfIn PDF document text
    • http://zuche0551.com/upload/file/gitedifadelu.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/darujitaliliwevap.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202154814145085.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gipapoweboduj.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c95c9f4c4ef---38366766062.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82deeff4a---fojav.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfc85cc01e---21437717896.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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 10772 bytes
SHA-256: 8b215d6f5b39ff5d80a60805c93b513614910715da10eb8831bc9f63889871dc
font_01_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 17112 bytes
SHA-256: 8ab670486d4c0f4e4a211eafb2fc83ff86b87d9694f8b20185a8dd63bd3662db

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