Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a91e61d4802783b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 00:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c74aef0d92d418e9d4693ea0d0d842a4 SHA-1: b1cc1258a8f47b4601873d1ef2c9700306ffff73 SHA-256: 3a91e61d4802783bc1c663ef7356e4b5590d521d0ddba19bf884c0b705217adf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised or disposable hosting domains, indicative of a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The file's structure and URL patterns align with common techniques for distributing second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tapuionoticias.com/ckfinder/files/15807966136.pdf In PDF document text
    • http://dobre-jaja.com/Upload/file/91503483511.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57164e280---mazofis.pdfIn PDF document text
    • https://badoza.net/userfiles/file/38379177788.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f824b1b7---nikaxuwegebiwamuleseg.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b54d452d52a---jilipa.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/lagasebasadisesosuxaga.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/75740174552.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608452f9acd85---murowepe.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176eb5f324---8822015617.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/kunuzopufuzuduf.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/5d63d360bb4f94d1a76886c77638bd45/lozekamekizepokaja.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/83583222960.pdfIn PDF document text
    • https://onlinendttraining.net/files/88209730215.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c4ab0b7e8---91270408184.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/detedepefubekit.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/jagurarorape.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/17798055995.pdfIn PDF document text
    • http://lnv-cnc.gr/userfiles/file/sufafikawiwuvigak.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/80143612626.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/93788783493.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=electrical+busbar+system+pdfPDF 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_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 16624 bytes
SHA-256: e92e3a53399be46106530740da6634bb656e381e784efb96eb6c33a21d04dcdb
font_01_sfnt_off00010118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10118 10896 bytes
SHA-256: 4d3281b0b8236f747ac7ef742f82d420a32f7c66b95ca7ef42053d956217d7a5
font_02_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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