Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b72e75c0ed36755…

MALICIOUS

PDF

95.3 KB Created: 2021-08-16 01:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 351b9426b3971b08a49ad9144cc169a9 SHA-1: 3d6a423088b476d895b0a6a618d76079940e2b5e SHA-256: 0b72e75c0ed3675518aa4d34965c6966e85c74134bf0ae49bd2d9cdd51a0827e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://sixtyguildersresearch.com/admin/photos/file/kisigol.pdf
    • http://vtvxm.vn/userfiles/file/56482743098.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79d7e91cf864ddb3ae987aebed3f9bdd/satezasunazar.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/pagasawixidopusuriwigi.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/5seov44p09jqd3goglnv521bf4/82441846818.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/d62688e436018dc1b071249e8a9a7c67/xilebesoputurew.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9a78239a---zasagolumaxupesesomijava.pdf
    • https://antae.be/app/webroot/uploads/file/vowokititisumemogebebul.pdf
    • http://msamerica.net/clients/873634/File/wuvikizifitoxizibawe.pdf
    • http://anthonyvienna.com/sites/default/files/file/21840286204.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfd9f2dd3e---fuvegovavoxuleretopedigiw.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/cde3b585dc046f9564ede6a3a4ff96b9/wemubopivivixiritopij.pdf
    • http://k-souz.com/userfiles/file/wivezapivuvusigowotodexex.pdf
    • http://rgn2u.com/userfiles/files/xovusedinomasulamilitokig.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45345db46---rabivufapimenogukiz.pdf
    • http://billsky.ee/files/file/15407090985.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609197847d5ef---91704681472.pdf
    • http://fogathajtohirek.hu/fckfiles/file/nagared.pdf
    • http://pogservice.ru/userfiles/file/bogawotedesijor.pdf
    • http://unseenadventure.com/userfiles/file/23368528806.pdf
    • https://sankohomestay.com/userfiles/files/23992029789.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wade+qu%C3%ADmica+org%C3%A1nica+9+edicion+pdf+gratis
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010af8.bin
8339c2a270e478c72fbd5f14054ffeb5b2362a610f8341026076205c13e72315
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 18208 bytes
font_01_sfnt_off00013957.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 16792 bytes
font_02_sfnt_off0001516e.bin
ff7bc8d96c3d5146f98fa31919422d5f91e8c46551a7942fde22ffea01250414
pdf-font-stream PDF embedded font (sfnt) at offset 0x1516E 11568 bytes