Malicious PDF — malware analysis report

Static analysis result for SHA-256 f900108aa06625df…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 02:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1aefe2e489687bed4e335f8829b92374 SHA-1: de5feece8c77f432600feed57b46fe798bc93a54 SHA-256: f900108aa06625df7ecffe90c5534dc5fa55fcb4fabe5d5ba0eae0fc4c76babc
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised or disposable domains. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 http://amandamaitland.com/images/file/betekepimudose.pdf In PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/vobetelemogukizuvegisos.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/48419760319.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/a2n6g5tp96rs806h84t7m3mhca/93700371812.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ac85c55e6fd893c823b6dc7d4944a459/pifis.pdfIn PDF document text
    • https://digireg.dk/upload/xirelelogunesa.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/baturi.pdfIn PDF document text
    • http://schokobrunnen.com/idata/fapavoguponumikujadegu.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/rorajewifexemukakatuxof.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/17939420090.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/59069993720.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc52c619e06---vejanogoweb.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/namojef.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a93018084---tonirobesu.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/46538061897.pdfIn PDF document text
    • https://tappowine.com/file/fazinalupogirelig.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccede68ce98---10917889113.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/20681077eab2d216c308aebca47486ff/90853372744.pdfIn PDF document text
    • http://apvn.info/userfiles/file/xikapu.pdfIn PDF document text
    • https://foulardfotografando.it/file/77570969393.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607120431fd5d---45641695850.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca7da68e38---43572665096.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/kojobexabalugukufogaj.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/kapos.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c635f44eec4a530f402a28485ba8acd3/zibujexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=elevation+chophouse+and+skybarPDF 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_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 17812 bytes
SHA-256: 69585d8d4c0bb65458a11e84a3a47f9ebf788bd859da92c2e996b1439576d056
font_01_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12911 11104 bytes
SHA-256: 82a7bc7da3171f1b7fba803b7df3cbfdb96fdfafd67fe8d388c453e0f4e72187

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