Malicious PDF — malware analysis report

Static analysis result for SHA-256 753ab3cd1e15a03e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 17:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d69b3c999a2dbac25f36e423422d54f7 SHA-1: c2e4479de6eed86df1d32a87ef11b30f6509d0e4 SHA-256: 753ab3cd1e15a03e75b8dbcb881cfa91a13cc850390b4466814bcb9b385824a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to numerous compromised CMS upload directories and disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites through these numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=prison+break+season+5+full+episodes
    • http://appli-veolia.net/ckfinder/userfiles/files/vibobudunetiboxisabuw.pdf
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/90849114807.pdf
    • https://bushregenerators.net/userfiles/files/76953400569.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6ccba038f8cc86aa9ff3072a49d8ecbc/lanovaruzapu.pdf
    • https://ciela13.leaddeehub.com/userfiles/files/dumeninasafaju.pdf
    • http://droneducational.com/admin/userfiles/file/nenusij.pdf
    • http://secretinvitation.net/images/files/24907060128.pdf
    • https://twinslock.com/locktactyuma/userfiles/file/98358013796.pdf
    • https://hizlipin.com/calisma2/files/uploads/devegusopogawiwutubudix.pdf
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/savabodozovametinijun.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161426b6b63c7f---87664303444.pdf
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/gejaviruwaxusiwide.pdf
    • http://sententtech.com/file_media/file_image/file/50820489600.pdf
    • http://wych123.com/upload/files/patejiw.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c5ee4d775---53605674794.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143bc66c59a8---58687370859.pdf
    • http://luatsugiadinhviet.com/upload/ck/files/fowejojovokomirusum.pdf
    • https://vntdc.com/upload/fck/file/foxoroxabufi.pdf
    • http://dakdekkersindex.nl/images/uploads/83880188047.pdf
    • http://rent2day.ca/ci2/userfiles/files/53476244019.pdf
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/53114327092.pdf
    • http://apothepharma.com/upload/files/jinegebira.pdf
    • http://offerseir.com/basefile/offerseircom/files/kagoguzuwagukumos.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3e00abddc---powanamaxogomareta.pdf
    • http://indel.sk/userfiles/file/37389708989.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca5e.bin
726b455f106ceaae1026412d3e37c28a98eeb96b4b98b061c21510f1c1376fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 21012 bytes
font_01_sfnt_off00010153.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 16792 bytes
font_02_sfnt_off0001196a.bin
4455de34922cff3eb6a1e7c13a641398a4fcb1375a1287b97f1faac8065a161e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1196A 10860 bytes