Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8dd97228244bf22…

MALICIOUS

PDF

86.1 KB Created: 2021-07-16 09:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2289a8f62864c448240ada818d59d290 SHA-1: 4d5ea2157b6c50895df827b4e2a6ea38ca1794ec SHA-256: a8dd97228244bf2281b369973bebb6ed69c4bea0ece932363db9c4c920f6d710
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the use of disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://mosaicopeoplecorporation.com/ckfinder/userfiles/files/pakutinuledidomavavewama.pdf In PDF document text
    • http://screen.by/images/file/ridamezogapemepunekatid.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/dopokobomuzawufoxefa.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/87408060979.pdfIn PDF document text
    • http://agrion.org/upload/fichier/94811063539.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160777ec4d447a---56701121238.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/00e4llo7bre9kp7kmq6o83lvg4/wexakidugolokaxiguxi.pdfIn PDF document text
    • https://vestol.bg/files/file/8236231292.pdfIn PDF document text
    • https://saam.vn/images/content/file/34219144941.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0386c98e---49274917172.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/lnd59l13h36bqaqd2eaalpv48n/89685341832.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/khakgpmosc685rphe4qvemh2nf/25027901324.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/31146442556.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/monav.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/muvapenibarefagoxipotiv.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/lubufudolilufenobeladigu.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160869540d5a04---rawaka.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/1239bde229df66f562f518b65e8d72de/47014899359.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/xafagajezinesati.pdfIn PDF document text
    • http://xnucleus.com/members//member_images/files/negokumelegonanariwiriz.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d738ae006---mupogem.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6387e54b---98569993229.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3b0256c7e7a5c25f29aa8df08a4367c0/gegapupopilimanawavu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/a1e0b7b41b11c0f44e92d7bc78e6448d/dasexobunevodux.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/14381217156.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/3b259ef1b1e3a63dd6306d6fe26a8284/sabatifixagixegowuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+crop+canvas+in+illustratorPDF 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_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 10480 bytes
SHA-256: 09fe3e342558f34d5b0c8ff16975e1044db0339e0fac8221394fa600641a6eb1
font_02_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 17180 bytes
SHA-256: 9c69b6ac4fa371a48f1338c788e9cf95f0059a7387ffe4ae539bf96c0ecbe6d9

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