Malicious PDF — malware analysis report

Static analysis result for SHA-256 fac9957547324265…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 04:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f1592c37c0e05310ff009b31a53e67e SHA-1: 65d6f4b1a504bc512cf35388b2694d98bdacd31d SHA-256: fac9957547324265ae8ac26c2434402966cb88a1e36abe6001d784f6fe568e9a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://laborke.ru/uplcv?utm_term=how+to+block+websites+on+chrome+mobile+without+app PDF link annotation
    • https://marathonroller.com/userfiles/files/32000350310.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/34714941401.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/didimilusarazazos.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/98168713793.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///16884514341.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/30640513614.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4n5ngvncn1ij8rgmjk4smoj6gt/lupitesupox.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/98317832937.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/10061017395.pdfIn PDF document text
    • https://truckforceone.com/upload/editor/file/wudonabunavifotupe.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382d4fbb020---18766026393.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-25/20210925020856387320.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/xiwakanimolejutusupolame.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/88925820994.pdfIn PDF document text
    • https://membermimpi.com/contents/files/wasesijojifuj.pdfIn PDF document text
    • http://beiks.info/public/file/19139042836.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109131257215411.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/jizub.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/35821973668.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cbae20e95c5372275655821b596b6160/raxovunefututinele.pdfIn PDF document text
    • https://pepsima.biz/files/file/54563164674.pdfIn PDF document text
    • https://ismart99.net/upload/files/97587042066.pdfIn PDF document text
    • http://poliambulatorioargentina.eu/userfiles/files/dojireg.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_off0000aeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CA 16228 bytes
SHA-256: 950a55a2328f0913032dddc20f0ace935ee4574781ff3528e327e257e5a4d329
font_02_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 11048 bytes
SHA-256: 53eb19192bf5b6b9a130098a0d484b5b2462cd60b4a34cdfeb2d39483505cae6