Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ea7282f2cff663…

MALICIOUS

PDF

76.3 KB Created: 2021-09-20 22:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2d9554aca80aa916f63eeebde14eadac SHA-1: 97833441c868eaf326efad2086d982a0fc305afb SHA-256: a5ea7282f2cff6631ac48fd0463cc1f311020072754aa2546c97f42ceeadfcd7
196 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, specifically a 'Browser extension / update installation lure' heuristic. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of the lure and the embedded URLs strongly indicate an intent to trick the user into downloading and executing a malicious payload, likely through a compromised browser extension or update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://synerhu.ru/uplcv?utm_term=android+email+crashes+constantly PDF link annotation
    • http://archpiudue.com/userfiles/files/37210002255.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359c4f73eba---74293758120.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/51353108113.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/rilusivimigukiwewe.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/69100250837.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/24211394691.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/dekadagote.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/susudasukofuxudapalet.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/20980959076.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161324eab34eb7---wafiwibiwukogowifo.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/14876676413.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/65425735337.pdfIn PDF document text
    • http://misbahelmudii.org/ckfinder/userfiles/files/29968250218.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/bilafufataki.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/dekudapa.pdfIn PDF document text
    • https://ewt.cz/res/file/35763292988.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/liwelajuwi.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/94759579902.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/reninibofaxugevetigin.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/48321392808.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/41847854980.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/83432508799.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/98125652012.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/610fcf377501be52797e300ef7eef9ed/pipizadeluwonesexovigezap.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/46269088053.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/64542216319.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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 10728 bytes
SHA-256: e716615d32b4a56e2d40b1bfbc7024525d53b0aad5b548bf5db29bf62e33a1e2
font_01_sfnt_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 17632 bytes
SHA-256: b2ff744de1532088712cc8f05fe197b916a5ae14b5f50edfb0f3bc3d80d1d822
font_02_sfnt_off00010b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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