Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62f15da1fe73dca…

MALICIOUS

PDF

93.5 KB Created: 2021-09-01 00:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7e6be1ee281bfc64992f1088daed77a SHA-1: 79606671783d60deca666056da504b432c96d6e3 SHA-256: f62f15da1fe73dcaa20c236418965c7d050014437babf199f5249dab7ff6e174
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites and disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8e8f6a1c480520c9cfe7b3e9918369d6/77434228787.pdf In PDF document text
    • http://plnjl.com/userfiles/files/12078637679.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6e94d60aa---vinerevekin.pdfIn PDF document text
    • http://chinalabware.ru/d/files/21504790000.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf614e4a5---24721303636.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/d1b5ddaf71968a51e874e7ff05d90ae7/xipusuxapolaf.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/95991097711.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612a52ce7a78b---vaweduna.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/moxowudarizopek.pdfIn PDF document text
    • https://akemi.ro/hirek/file/51608082991.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc2298d2e---20506598193.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/dapivefej.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/xajetibofisurosamomizuzi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/rlpjmlg4l1ar154njlvg0logs4/jutewuke.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/5004285006.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48938475902.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3d2d54796---39348910808.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/28f468afc008b506c58c3c77713ca099/zesiwi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3ec49b6f48493820d548b0973ff2faa2/22173673692.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/18178223814.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18586339204.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a788bd2b852---78332827915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=15+minute+yoga+with+adrienePDF 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_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 17740 bytes
SHA-256: 817405fb279a7bf1d8ba3efe76a196ee07a9a940dba6afce69c6cd7ce3a65672
font_01_sfnt_off0001368d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA4 10872 bytes
SHA-256: e70fd8ebace3e04c7477a5776187dd592f698a6f983e0b2f89fa879d26d0c05c

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