Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cb5e15a4744fd6…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 06:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 50482e6d6dbb6da84312309f4ed3acf2 SHA-1: 38a8974aab1fb9416acb4ded2ddd32603e50402a SHA-256: 55cb5e15a4744fd6e512a12339cf9570f7d8e1d8ade9397a25709d76c582f546
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The document body is unreadable, but the heuristics and URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://manpowernepal.net/ckfinder/userfiles/files/48492628210.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jnp3u7udm63t7s6kmrnl32itne/38086223549.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/13182522640.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8afd985af---52131741375.pdfIn PDF document text
    • https://led7.ru/file/bujosaxemexopokamuku.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/geketugexizupodabipoxub.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/nobozogovofuvosen.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/wuroxera.pdfIn PDF document text
    • https://laps.pl/userfiles/file/20461327274.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/65006897304.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/88757292295.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161340ad01df52---30924105662.pdfIn PDF document text
    • http://koala-al.com/d/files/75914519884.pdfIn PDF document text
    • http://hexindechem.com/upload/files/5549386879.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e911b9470e---30864852448.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/69964346668.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/kabemirepusakorobebinum.pdfIn PDF document text
    • http://shahgrp.com/uploads/31237186058.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/70804905544.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/16833473155.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/87276342592.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8ee270c635ae70c192391b74acc36f0f/96089191511.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/xisotejajuxokovisib.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/tonekerowixevukev.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/xerawibisopumaminuvaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=aim+assist+pro+8+ball+pool+apkPDF 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_off0000cbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAE 17616 bytes
SHA-256: dcc1e6a8ccae911be25b63c20c320dcdcdaa03171e74d14057ff5328ad5d89cc
font_01_sfnt_off0000f98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98A 10596 bytes
SHA-256: 2ed1bf3c35567ee365cd489ec22b0963f2d05d0bde53d0314f5c2ab3054381a2
font_02_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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