Malicious PDF — malware analysis report

Static analysis result for SHA-256 605605d99accb8cb…

MALICIOUS

PDF

81.9 KB Created: 2021-09-22 11:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bc68fa9998328ddd2c17eee93e72807b SHA-1: a5a6e346b210ea833fb773a81ff4a2a4dce9a6ea SHA-256: 605605d99accb8cbb66dfb6091e69854f69ea698a6d03e85e886fffcd3942709
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to various external websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://gabinetpro.pl/kosmetyczka/krakow/files/36031623777.pdf In PDF document text
    • http://global-leasing-management.com/uf/file/25432339652.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/zudatotafotojowarutor.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161404a627579a---bufuzax.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/78e7397oos2e6o7h2kpiamo9gs/kozerinaromi.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/71053470877.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/99918169579.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/88873608812.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/56416455310.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16146562c9c657---javedotixen.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dac986d6---74058522759.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/nuguwanegavopo.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/ponisifomebifogitode.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/9175292834.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/12169565412.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/84416444085.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/fuxugikavokesagugefu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145c6cd1f566---jakarenokazujidapedowa.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/93199338004.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/11431025112.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/disuxezuk.pdfIn PDF document text
    • http://platcometals.com/images/file/69615019705.pdfIn PDF document text
    • http://ifap.it/images/file/74004824967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adult+player+apkPDF 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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 10188 bytes
SHA-256: dab06e529bcb253ba1796b3f50b24182c94832a2781c100bad327753a132219e
font_01_sfnt_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 18156 bytes
SHA-256: 786adc55ebf3b10c9fee4445bffea815455c263ee295632aa2d188375b1e34dd
font_02_sfnt_off00012245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1