Malicious PDF — malware analysis report

Static analysis result for SHA-256 a30a5c11584e24b8…

MALICIOUS

PDF

86.9 KB Created: 2021-09-22 12:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44f93ca19f3b01782bb2a7e6fb61249d SHA-1: 31a20d7f743084393302bc9ed63414e3f8bd8460 SHA-256: a30a5c11584e24b8d9b8d6f0a74261bc05ccf3ab9838d5154d104f555ecb80a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The PDF itself does not contain executable scripts, but its structure and the nature of the linked URLs strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://mya1fc.com/files/ckuploads/files/zirekopapezutikasivi.pdf In PDF document text
    • http://119pump.net/d/files/minajuzibixivijunuzevu.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/todawekaketazuzogoterowe.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/86259352131.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/jepodikij.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/24855807040.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/39200859271.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161416620bab14---favetukuwemivu.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/rinelowogazel.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/859993243.pdfIn PDF document text
    • http://platcometals.com/images/file/33897120841.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b177b7302---34411922395.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/75332010397.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147413f128a9---ridijotewike.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/12264107045.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/mugofomarironitewarefe.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/siketapolojovumuju.pdfIn PDF document text
    • http://acelybio.com/upload/files/muperamutokidagamefopinax.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/56589107277.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/20089052f494f4211f324ac2a5ce487e/lirodubase.pdfIn PDF document text
    • https://avflash.nl/upload/files/fitozeruxixusediwubewe.pdfIn PDF document text
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/doxodasogefasovasazuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=after+we+collided+watch+full+movie+online+for+freePDF 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_off0000ee2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2E 18160 bytes
SHA-256: 27b47eb43e19ee5430abb47d28ca288c88784e7b63d8b91f56a6a51e28ca7294
font_01_sfnt_off00011d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13570 10804 bytes
SHA-256: 112bdb29b047155ac1e713a701e3326abaf7a4c084bb41f1b052cf43deba702d

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