Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b38b5704f2bb36d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 08:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a1ad52ba9732461000a17ce12c501866 SHA-1: a86cfcd074a3fc3378053160c8a24cedbfd60b90 SHA-256: 3b38b5704f2bb36d6dbfe6bec3ed609cf04ec3ab6b0edf12f52be080f6b600b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. No scripts were extracted, but the presence of numerous external URLs and the ML classifier's high confidence score point to malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=nest+thermostat+manual+control PDF link annotation
    • http://moscowprice.com/content/xuploadimages/file/zarutodetabomusiwi.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/60873211806.pdfIn PDF document text
    • http://keramann.ru/uploads/files/39247801413.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/10290317540.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1db4d56c---gusaluno.pdfIn PDF document text
    • http://riceart.ir/basefile/files/kewumorupoxiforuwepege.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b6p1fa55dqdv5g5e26g64897u7/43300262442.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609532b928a0b---tatel.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/90572455960f92cbbe7f12.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/wipev.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836757173a3---77099705565.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202152859354367.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/40443636911.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/29538680735.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e4ca2bf32---veduxigeri.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a6763682a01a34d9cff4efaeda6f0932/41951032974.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608242f2ace40---32510614497.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/zumakixuf.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/91c4c93423ce974e1e6c460edd3202dc/34191302380.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/gevufijiga.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/lifituxuxekasuxonid.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/71926450930.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/95111815294.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/f9c3f200364b65247b126cac8aad7c4a/83269965973.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_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 18564 bytes
SHA-256: 69d6a448d02a4aef83cc67698911fb2c9e7ef21a89cbbe2982070d5abe09cf54
font_01_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 10480 bytes
SHA-256: 586c6e348f17d33bc8a95933189ac83ea9e74b74db6b4549766d0c818b8a1c80
font_02_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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