Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58716ce83635b3a…

MALICIOUS

PDF

86.9 KB Created: 2021-08-04 08:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: ae47ef3130d919c2d70a3d039f1a69e5 SHA-1: 5a6b19031bada4b9f14d95f4d6b1815393627510 SHA-256: a58716ce83635b3abf5cb43c9557e494b6d28819d2348d067023860a33a17d5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://poorclarescork.ie/images/68622704086.pdf In PDF document text
    • http://zovsh.com/Uploadfiles/files/83099634237.pdfIn PDF document text
    • https://kopari.hu/files/file/48447728797.pdfIn PDF document text
    • https://citytrafik.nu/images/file/dinevivivetu.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/bijusamebewezaxuvafeniw.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/wutiguwumezawagalib.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/95104096961.pdfIn PDF document text
    • http://vce34.ru/attachments/file/tudosarelixujabufomemepab.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f55d6a040c---dekenawasuf.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099259ad897b---8757493918.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30663326582.pdfIn PDF document text
    • https://hoalavender.net/upload/files/29645851345.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/magisegegabemumefulonud.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160922c61c15ca---tomavupuge.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/xeximixovuguxek.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/nikovamekenuziwofugina.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/mimoniwo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/12bbeb797c21b16e862d305e547e1823/jiwikekowelewi.pdfIn PDF document text
    • https://whitesal.com/data/images/file/1285_20210603101153.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a981702f7e2---zitipiwixatixokesowovalag.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/20b433cf522d55309c75e20500094829/ripawadadazilogevufuvexu.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/44998213319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+calibrate+my+taylor+scalePDF 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_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10620 bytes
SHA-256: b80200e9593cb56bf0ee03a74af1c4b4049c55e75d1ad4c482aba25a17ae1cda
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 17956 bytes
SHA-256: 43f3a2f1f6c0da981aad73b333a50da12144d21a38974e41e5fb514c1703d9a0
font_02_sfnt_off00013554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1