Malicious PDF — malware analysis report

Static analysis result for SHA-256 197ba8fab6a13c62…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 00:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2571e324418ee53568c4edda367347c1 SHA-1: 0a463ee952083cfb03b07bb1eb23c71f1498b736 SHA-256: 197ba8fab6a13c622ebd904b55d3b0911cb7ae16ac8fb12aaa55d62d4f777233
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this malicious intent.

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 http://clearspace-design.com/CKEdit/upload/files/62360221329.pdf In PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/eb7610bea61e0d80d21353fbf8ad727b/kibomi.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/kijilasilizagurovuzepa.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630648016.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/wuwanawo.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/jamoromilokurivaz.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/nuzulomerawopuzukuliw.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e5504cbc326580b3cfe2b0e14d138e9a/bezuxasoj.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132fd4cc5f2f---vanokerubanisus.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee49c794de---figulotopod.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/f6uuvf9uenosnbr56vmi67haqu/51390690922.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/89241531654.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/89460502126.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/94068094887.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d128f341e2944edc12073c9aa091e903/jipejakim.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa9b15785---57014215215.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161431c5a5710c---37577966470.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143208c752e9---49051140062.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/xeneruronuzenot.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/fimajutazujejelet.pdfIn PDF document text
    • https://adikmanis.com/contents/files/46702805546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=unlock+my+android+phone+freePDF 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_off0000d05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10832 bytes
SHA-256: da603bafdc757a5be7b6ee91ff2be42a18cea19283ca4b93b613a82039097edd
font_02_sfnt_off00010130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 18880 bytes
SHA-256: e34314089d22a4421b1cd8023681abf748726bff39a1704ec601da1a5e6394ea

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