Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ad3fc0a0cdc105…

MALICIOUS

PDF

84.2 KB Created: 2021-09-22 22:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c1d2f40ba716a20b5dd6b5781ab5e079 SHA-1: 4a69082fde088be43122e0fbd2999572dab194fd SHA-256: e5ad3fc0a0cdc1050464e90d6bd4671a859304c8a282777b0ea4df53ef0beb15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains a link farm pointing to multiple disposable domains, likely intended to host malicious files or redirect to phishing sites. The presence of external URIs and a link farm on disposable hosting suggests an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=download+ppsspp+for+laptop PDF link annotation
    • http://hstechno.com/userData/ebizro_board/file/toninobape.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4ed1619ab8b55a6fd1c9407159de1fe0/27203773710.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/jeserado.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/ripiwokanet.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210921_D97A32E98E0C5542.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131315dbd852---xejudabigubepudu.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/nimomeren.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/jalp05h896qkseus354k7tvqm4/16435017811.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/gidaxuzuzaxofinotovinalal.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/92903718912.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/dotadekejunolagogabuwa.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/94800383064.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/36950456807.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/namiresama.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/3949787294.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69a923be9---wupefujozudutosopu.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/zizedafejitewamid.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/rikakakisefapim.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304bb1d03e1---mapome.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/81273867616.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/23455686712.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/74789264593.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/zototoleviresutinuvoxugo.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/17819865351.pdfIn PDF document text
    • http://actinq.nl/upload/file/45949142227.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/18728944643.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/94736993106.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_off0000e593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 17536 bytes
SHA-256: 772bb36b7f6d6aa6176c9c2e3fa6c9f65a61905f31b2b9f158eb1dbd7101cc20
font_01_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 10356 bytes
SHA-256: f334ce2f0842d7475e667531d4aca95fac2aa30768771c9a121e410f9bb2fb33

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