Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce70982ca4ef92e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 16:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10a499a3813687d99be7bdd83b8f12bd SHA-1: 6c78e558daf4c02090ac06e2a6866f575c8c57cf SHA-256: 9ce70982ca4ef92ed8596ae9d74d711fb1c453a1849e422025fb87328a3349dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as phishing or a trojan. While no scripts were directly extracted, the PDF structure and link farm heuristic suggest it's intended to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://gianniarnaudo.com/userfiles/files/sibelexeperotezoberex.pdf In PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210911_051312_6909.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/32934220592.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/o8vvdil1qe2r34eg3odblarssa/ludosu.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/wedaturujedopilafefakax.pdfIn PDF document text
    • http://freeski.hu/freeski/file/67233391508.pdfIn PDF document text
    • https://termofriz.rs/files/dovozudobudu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/nprdscd4jd4l38r1q7qbf6d066/6795085153.pdfIn PDF document text
    • http://101balkon.ru/upload/files/55924655537.pdfIn PDF document text
    • http://ban-dong-ban-mat.theonejsc.com/userfiles/file/dikakegokapevobemixiw.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/bavapaxaxonofenuzavise.pdfIn PDF document text
    • http://full814.com/upload/files/vaxixerozojojukid.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/zuled.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/mulasojujepobojamedanotud.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370fc58c231---53786907729.pdfIn PDF document text
    • https://path.mn/userfiles/files/57815371811.pdfIn PDF document text
    • http://nscenter.cn/upload/files/rikaz.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/jagubexomonige.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/rilovegu.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/vakugidivabesuminab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=supernova+movie+2020+watch+onlinePDF 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_off0000ac1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1E 17112 bytes
SHA-256: 3cc83a70fc0a9c9853d519e71b54f79bf62fb1b1681e403083a75d4fe7c8dfe2
font_01_sfnt_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 11040 bytes
SHA-256: a9971f721302b678dd47a498e3c81381d53fd124e1464ad09aad7711cce0a940
font_02_sfnt_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1