Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a4f58f437e2c82c…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 11:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 375c1b86bddd583c48ce6a4e99a7ad1b SHA-1: e229bc4ed96a1ffee21262e9fac4bb9d1113d15e SHA-256: 1a4f58f437e2c82cb0b82e1f27dac41e0963826cfc49b57f9df7f75c094e641d
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 contains numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these URLs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://allytemp.ru/uplcv?utm_term=among+us+website+play+online PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c252ef377---puxunowebasilodij.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/fesukinorumuxeruk.pdfIn PDF document text
    • http://falerisztika.hu/tmp/12723202666.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/texezugagorikabawijufezur.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/37125312381.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/eaa0220d8ed837076fb28df400225214/tululebaroduvuxokirifet.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/sawapog.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/580526227.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/lelodamegemitepokon.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/kopukefiwezar.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/56062917936.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/6977186ddd312dc4d82324cbfee62c91/xetamu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ea9c54ba7---natixad.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/48682393386.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/xirobogofagebeta.pdfIn PDF document text
    • https://areicon.com/images/file/wuzapakefodadigelil.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c6d6682f94ddb3d4f5eb8fc4a4f26d1e/54150153277.pdfIn PDF document text
    • https://mkontroll.hu/File/negasakazox.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe34bd45c3---92161937299.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/vekalop.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b54f6576b---xujisenikuxepezunati.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/61360450185.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f1cb659079932662dacf52ee7960448a/86248292175.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160921bc0703be---91597359608.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_off0000c99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99C 10916 bytes
SHA-256: 8ec3a41ce11442760ca33899da78082d33dd6df4bc0a614383e05b3ef5a96c50
font_01_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 16740 bytes
SHA-256: 1e2f1b1fab76287b28582fd65e5dbabba549c8df1f0baabd91314b948f85e407
font_02_sfnt_off00010e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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