Malicious PDF — malware analysis report

Static analysis result for SHA-256 756bec2072f5ee9d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 22:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84ef2236902aa4daa16d797bf9c85838 SHA-1: 38a3422f9738a7e4f67ccd01d66f90e4482aeb96 SHA-256: 756bec2072f5ee9d762ff29ee546e780f891fc39edb247114953a67abd7ff308
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number in a context such as billing or technical support, consistent with callback phishing or scam operations. No scripts were extracted, but the presence of numerous links suggests an attempt to redirect the user to malicious sites or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://allytemp.ru/uplcv?utm_term=react+native+support+android+version PDF link annotation
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/216acb169fc3e99c0ec40f74d2c03513/bidexafanububuzogepev.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/wimixuwobobedo.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/wopaxev.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/56128162948.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/29798888682.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/75063649462.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210918035750.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442d9596096---lilolewisegusid.pdfIn PDF document text
    • http://immobilieninvestors.net/userfiles/file/96878643571.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/senagivajumuxotaxegiwum.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/45330672479.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/rusibiferajimasibixasiv.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/dulafaminujunita.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/09b977b9d2f663f9965684e3b02b6998/zuzulovudanefobo.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/56798262504.pdfIn PDF document text
    • https://bataretak.com/img/files/file/xufakuwukaruzawekug.pdfIn PDF document text
    • https://camelcarpet.org/d/files/63068391084.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i18jrla8sodpkdhrsm0ue2ac2g/20359839888.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c924d1db44---7529142385.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/kapejilodi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d279798cbc8bda57ea2b8c6bfe555220/pilanew.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/75153106079.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/6761172046.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/49586605097.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/fowebed.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_off0000d6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D8 18188 bytes
SHA-256: 6e120752e25de9bbb02801837bd4f846f405c5b16d63a2d98f72d5c9d445aebd
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10672 bytes
SHA-256: 9dacff63abc7d8758b80764a617fe143debe825826afbd47c2e5ce1573d50486
font_02_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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