Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afa582c3dfd27ef…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 14:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6010328af49c0a4e4d2e71adf228dab3 SHA-1: c7e6973b56d0bc77c955903a534e37df6fd73064 SHA-256: 4afa582c3dfd27ef87b48770e67dc12f45b4b5c83c7a8538796a5eb8d26dba46
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/dfa29a8c8454501478d3383f9237dc76/68630305428.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cea6a36d634e4c1b821798bf1799cdae/44746528190.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/85323212436.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nexixowuninepam.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/tiwuxilozur.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/66909564640.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/43289259252.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/rerirakumuzesoniwadudi.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/woxuwijojuweva.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/5005651603.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/juxoloniwamudekimawe.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/64567854123.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/roxidodaxeriratulorusovo.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/rewaro.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/xegalepem.pdfIn PDF document text
    • http://dfanchem.com/upload/files/nijipuwe.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210903_92508320D54FEF3B.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/17414629135.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613504501a9a4---zaxerosowananekavarirugef.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/gidasusesoxusonadifole.pdfIn PDF document text
    • http://bresky.cz/res/file/43844537078.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/70486456259.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=union+achilles+qr+codePDF 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_off0000de64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE64 10520 bytes
SHA-256: 3924a003bceb02d6d4e67ee6dac1980d475fcdfd1dbeb435b1e2bbce55ee2769
font_01_sfnt_off0000f606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 17744 bytes
SHA-256: 1fa5e7d18a4fc89f93609c7e9051879fa8ae0f6d81c569d6a90000a49da9f182

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