Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8fee3a0d34f26c…

MALICIOUS

PDF

82.0 KB Created: 2021-08-18 06:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4012960fdd7d489d02f26b112d646958 SHA-1: d776e74ff74a91841c710eaf6ee02a1256acd29e SHA-256: 3a8fee3a0d34f26c96115f75dda68da413c28fa6d5679e7317f6ac25ab180e29
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised CMS upload directories and potentially disposable hosting. These links are likely used to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=what+qualifications+do+i+need+to+be+a+paleontologist PDF link annotation
    • http://realcomfort.ru/content/upload/file/tikotegozubaterubovu.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/86317555398.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608472ec247c7---52028629992.pdfPDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/b14f76d9f4f6929305d3ccefdaa23405/xowivape.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e25f2fc09---74460979916.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/waxesu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ed58fbcfc1b---96953923862.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094304f2df30---waxobegifasosip.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/51863640879.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/50961143854.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/juvumezepaw.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4362be121---75377370748.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/pinojeligufes.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/84193519054.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/7082268919.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/76173853780.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lujevizesotogin.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/vigef.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/mumetezuwotilagixezup.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/10497335682.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a905bf75a9b---gawawututujuxuful.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd2cdb6347---dobodutukuvevolejoxovinim.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9548ad60fd---lagefavebitamebukufuxav.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 11180 bytes
SHA-256: 8ea3d84a12e22f9daa9c1a6f8991857f6c90c0d6d815fcdc8aaf6ac33e86f33a
font_02_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 15936 bytes
SHA-256: cb9e3da2e551a36cd57f2273a7f9b3c3ec4e6e414f2d75938135859e2753f321

Open this report in the interactive analyzer, or submit your own file for analysis.