Malicious PDF — malware analysis report

Static analysis result for SHA-256 1856df81866ea46a…

MALICIOUS

PDF

90.8 KB Created: 2021-09-08 10:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4c5e89a64094691750e8572041288f8b SHA-1: 67bc2b402e7b09b305fb6169c38cc713b13805b3 SHA-256: 1856df81866ea46aaa4649f2135922f91ec1a24a00ace0daf12bde144cf2ec2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=official+secrets+act+1923+pakistan+pdf PDF link annotation
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/89919910811.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/38466344870.pdfIn PDF document text
    • https://tonycustomtailoring.com/nbloom/fckuploads/file/nuwepazakuzifidutovuni.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/13452543196.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/dd2704104b6402b8b0a61bb805e51ed2/36663208779.pdfIn PDF document text
    • http://hotstamping.pl/files/file/zuzem.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/25724774846.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/fa78f0b54a3bb8dac81927b029d3046d/21119444251.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/wemajupojupogoxojevo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/bff22f0754071290a297563c935cb22f/68470319503.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/xalinuro.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210717084152.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16108dac376039---8475115735.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/sirejozajof.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kawoxari.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/danebakoteda.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074312d80157---rojepetatun.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a8e1163cc9df12cdbf3e649f59d17fe/buvos.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/19817112080.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/s5kepmhr6e8is830frblr3kbnn/ridaf.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611848ebf06e4---80001517915.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d1k4ebipuimp8893aflfquncrg/76959851960.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/30489663022.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2339c8dfc2---gefaruguxazalajixeku.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20a23442d---48251298382.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/nimos.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_off0000fbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 18336 bytes
SHA-256: e103d0e5ffb8794835253e1e646b1c58e0fea82e1cb48197b2fbd7bd2a2a654b
font_02_sfnt_off00014359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14359 11124 bytes
SHA-256: 3f14fb5debfd67909d0189cc90aae2e050be542f72c2ee23a64ddedbf601121b

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