Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e835b6ab2a1819f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 00:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb189f312bca55d3ca16493593c93276 SHA-1: 8e85ec8a1ce75f9f6c02b60f5515ff488a4d051b SHA-256: 5e835b6ab2a1819f93ff200bc4bb26b7cf768ee565ade2e154d0bdf289c94bb8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into downloading further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://emartdeko.pl/galeria/file/27635258308.pdf In PDF document text
    • http://decaldankinh.net/upload/files/44489847695.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/zuvidupujadikugagotiveji.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/93974722552.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/timawosojexexi.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/koloj.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/64677685863.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f9e27a07e---dekif.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/sojopipaxe.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guzezumavavudumite.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613009fd8ff80---nisav.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/wowima.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/goxirepunu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130724ad73b1---97152722774.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/89027367455.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/95551302377.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/19769842943.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeb5a17d42---xeguf.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/fivufexuwelivufog.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/gusidawanavukepakir.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/bokubogelob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=creepy+nights+at+freddy%27s+2+download+androidPDF 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_off0000ba3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24D 17596 bytes
SHA-256: 3e2035e7acec99f5309dc591a408dd16e7315cb912689e1cda45cdd0bb5c1ea2
font_02_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 11160 bytes
SHA-256: be0f3be9ef37ad31f2006fa40ebae5c080c3f209eea8c53276cafec3994fe2e5