Malicious PDF — malware analysis report

Static analysis result for SHA-256 5399e70323aa5527…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 09:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48d5f1cff7b261aa8a9574406932235c SHA-1: 7eb423f13483a5ee880be3d6267c10ae0abc34a3 SHA-256: 5399e70323aa5527efd88ba08ea60d15dfc9e24fe8569c14854896be33fd5fe8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=planisferios+sin+nombres+para+imprimir PDF link annotation
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb5e3004a---doronenuze.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/37ktu5adg342jti9dt1b2fmrf6/vudomaros.pdfIn PDF document text
    • http://sherylrobphotos.com/clients/56056/File/palidu.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fovogalavoz.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/teregapebuxuporixutike.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/82317540174.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99ab37c54---wiwederokajepepusalunafe.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/38226568892.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160727b54ad02d---1684621606.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/eebdbb5e3416c49960eee0401b9b51ac/35911755622.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5896b3fbf9---fifaxikotaf.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/3a6nhkq55gotms2h5pph1qnl98/supiworogaruzajixov.pdfIn PDF document text
    • http://i-dron.cz/data/file/73169300370.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/pimudawed.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/lh21hpj5tocbvalu39e54vc9vn/womezoratobusiw.pdfIn PDF document text
    • https://dineflon.com//files/xikonivikegeg.pdfIn PDF document text
    • http://naucseto.cz/storage/45607109240.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb3c099c9---mubefotipuwoborivejeru.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc9a9584ec---70790838261.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/50312933783.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b629121b---69020731346.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/26262410651.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080265ba0287---2582609267.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/jekawek.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/batasejirizebenelawo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97f0a7283a---xowobatak.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_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 17512 bytes
SHA-256: 9debcaf178cf40407f4642aa1b7f128e9af94d03b6ac60303160a27ca12c4a85
font_01_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 10560 bytes
SHA-256: 03ef5ccf848783c77bb99513fe2c8e69859f3699f768c0d8e725786e37111119
font_02_sfnt_off00012867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12867 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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