Malicious PDF — malware analysis report

Static analysis result for SHA-256 de05cac1a018107f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 03:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae252a04b75814675791004f5f36c780 SHA-1: 22cd7844fa791e0ecc1c17dad0d7f9fe4c0f301d SHA-256: de05cac1a018107fccb6f63d66197214dbac19fc1b87f65c0a6756a287c0e384
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm for distributing malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://firegallery.ru/img/upload/nebubibixedarojib.pdf In PDF document text
    • http://likebarcode.com/image/files/20210903_061331.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/meguxasalexozoxopasad.pdfIn PDF document text
    • https://latework.cz/soubory/pifamegaxake.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210913013558.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/81442593938.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/47be2e84e0df71f292d4def01610a058/31493628275.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/3504159383.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/65349211169.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/romevolajugopunefikezuza.pdfIn PDF document text
    • https://ghnservizi.com/file/vobake.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/kejidobowuzezigijirux.pdfIn PDF document text
    • https://windscrm.net/files/file/75719357061.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/19985171916.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/23724825301.pdfIn PDF document text
    • https://ip-pharma.net/data/files/69338402438.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/lopavajezosonapud.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/4b62343614cdf573da7ac7af38e0d5d1/jamimukagojimagarep.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/juwogagu.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/zokajesezig.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/4054333367.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/najusuziwukulamonol.pdfIn PDF document text
    • https://thehouseproduction.net/file/14407365073.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0b80bb3ab1e1090ec6ffca2e7f1085e5/ladolipamividof.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/78565793538.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/25368124017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hollywood+story+unlimited+diamonds+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_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 10936 bytes
SHA-256: eb48ebb53529d91e41bf15a744913bd6f5749bf12e9dbb34843dd974c52512dd
font_01_sfnt_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 16816 bytes
SHA-256: 249ca780b5839e98ae6158354e2589be79747891ba0b8869c916397b232936f8

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