Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a8848ed9ab3920…

MALICIOUS

PDF

72.7 KB Created: 2021-09-01 23:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8114cbdf937e57f30841480f34a18d3 SHA-1: d570887fa93a7b12175016d2f7a6f02c32139035 SHA-256: 37a8848ed9ab392064adf0fbb092480350014500172ac1788bd2384ef83bd3f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://garglob.ru/uplcv?utm_term=star+wars+angry+birds+2+apk PDF link annotation
    • http://verypool.cn/images/upload/File/60498196281.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/55212866951.pdfIn PDF document text
    • http://w-mill.jp/images/file/nivinajexugagatogaw.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1904b3aae1---solotaxudo.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/xokotemikobebufa.pdfIn PDF document text
    • https://tonitomov.com/picture/file/forekutivu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/37031eeb51fa954c8a8823fa93610bea/21047705894.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/siviposigimebuxed.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/31212827706.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/moxorupaponegawakalefumiz.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acb3c90b2d6---nexawabuwadiresemuvu.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/57968373875.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081b318b68f8---gosepuzidamit.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160879ec90455e---zojomaworujigisekijabuna.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/83143452726.pdfIn PDF document text
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/48829063848.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/tekebuvelaja.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b2228cf3e9b226bd9af10c49ca41cab8/46514252040.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4beac394ff---35196772204.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/33642980134.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/7159340508.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/jelejakenuwaguziwoparuja.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB630 17376 bytes
SHA-256: 441478e9b9209e0eb26cd87062585f67c1ad091daaeda525c0e32a7e86d6cc6a
font_01_sfnt_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 10896 bytes
SHA-256: 1e5443f07d107ef652a16cd5f5923a74a6dc0d5f9ecb3b74e3162d84a75d33f3
font_02_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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