Malicious PDF — malware analysis report

Static analysis result for SHA-256 af08c2ddc09f5302…

MALICIOUS

PDF

73.2 KB Created: 2021-09-29 04:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 06abd314162f5dfe308031139bf87879 SHA-1: c8e0be602434d245f39957815091c5eb2114aac1 SHA-256: af08c2ddc09f5302df3589e2aaf6cf539e5dbe791ff5d102edecb7966eba79a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://irlanc.ru/uplcv?utm_term=run+android+apk+on+windows PDF link annotation
    • http://fabrikando.com/cmsimple/images/file/68546909302.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/32484395838.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210913000230.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/45953462297.pdfIn PDF document text
    • https://slotpt2.com/contents/files/fakemajuxubetido.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/83040390170.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5dbc31f08---9237899426.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/48339846137.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/warakositilaradut.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/3903079164.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/fubupemuwaloxit.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/vurunoxalekizogumibak.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b8b6036641395d8183f946141f86356c/tumanesezemazajerugu.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/96296680844.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161424d51f4087---vubafuzogikibizokobeva.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bekogetujulaxelan.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/72185327009.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/99889963898.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/buzon.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/5354953007.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/cte44cjrtgupt4d3ovk06qsiu3/8847030287.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/63243285684.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/70279250324.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/85421187430.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c22e8b2b3---pixagutudujuxasiniroxese.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/60800397884.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_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 10432 bytes
SHA-256: 0c089fe53b01e4d756c879fcb3e815e011e2c4e218407193dff23264a304dbb6
font_01_sfnt_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 17792 bytes
SHA-256: 1f87b6a21b784f433bfccfc34854379c762fa8d12b8d2d42128621aef711c59c
font_02_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1