Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c497073aa7b85aa…

MALICIOUS

PDF

79.2 KB Created: 2021-09-18 04:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 58de51f1b2c1c79c4e909ee2252599b2 SHA-1: e5544fe9ad79c7d70284293e178a569d3b6f64e9 SHA-256: 5c497073aa7b85aa9022410997c0da70bc15c760634a73fa003c4569060b0f74
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to other PDFs hosted on potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics and the nature of the URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143291800a36---xejitiwuludoki.pdf In PDF document text
    • https://xnkvinatimex.com/uploads/files/72018387483.pdfIn PDF document text
    • http://net-work.cz/data/file/kuwukiwor.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614078ae79ec0---35822220382.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/dabimu.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/bobulos.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/fuwob.pdfIn PDF document text
    • https://majubesar.org/contents/files/jibilarumojarofodesuxa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131864ca140b---54353874849.pdfIn PDF document text
    • https://norservis.com/files/files/20801554668.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/22466920366.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/zarolukobitevirax.pdfIn PDF document text
    • http://trevorhannant.com/sizinivamidumalifexa.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/zadukerutomuludemigujep.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/27104223248.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/70136931353.pdfIn PDF document text
    • http://lovesenergy.nl/file/pibonetuwexojul.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/54816101517.pdfIn PDF document text
    • http://hkacca.com/userfiles/40446946231.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/zogerisoropare.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452b1096ff7---bezikaliru.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/35589648214.pdfIn PDF document text
    • http://xfswchem.com/upload/files/66247753848.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/43785291868.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/muxatit.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1777ddad3---3346262157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=friday+night+funkin+free+to+play+unblocked+gamesPDF 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_off0000cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 17356 bytes
SHA-256: c35447b69279d2e57b994d68cb5d53066207cb0105c4e8facf0cc3fd0fff4f59
font_02_sfnt_off000112ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AD 11488 bytes
SHA-256: ec3d153d4393296699600e858e175669a703e31127ff1f2be1446de183b4ec91

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