Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e7949b7a9ddb4b…

MALICIOUS

PDF

86.3 KB Created: 2021-07-16 15:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 48834a56a6048ddb364929ce649e0059 SHA-1: 949813230cbbdbf24a23ee087748a8957d7d0302 SHA-256: a2e7949b7a9ddb4bd0a0cdd983f596ce5812b67d7ae831cf20e06d2f4fbb0f6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=decision+making+is+very+fast+in', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://coretry.ru/uplcv?utm_term=decision+making+is+very+fast+in PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f934d07e---1234220170.pdfIn PDF document text
    • http://samtekelektrik.com/files/moluda.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/zerazotiluraxosazovifoka.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/5228122957.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/78335043433.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f72d3df08c---62981879599.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780360d4393---67222470739.pdfIn PDF document text
    • http://rogo-rotterdam.nl/files/tipitux.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/kolukakanatodipezekew.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/tawiwapis.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/zujixupuseperavobudegix.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/74aea6175743dd21b60baa25501a0518/14850627774.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/44814692691.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/bokepepopaxukisav.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/8qf6jbqb23gt9gbqf78ncnqc0t/tulagorimejutogu.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/9378b301e509a0cfbb24648bf8e9047f/94659545414.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c777fbf030a---88766970970.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0c2626ae---manunod.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/81eccf12d8cfc9239e9fadcce54e3d74/29174620477.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d955ae9a6af---28667919361.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/sapotuvezazajosexoletawoz.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/wazapibuvotum.pdfIn PDF document text
    • http://abpaluso.com/upload/file/maxaxisab.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/7pa4783oktvt8cnhjor7dr6pn9/26953967029.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9ad3b2a79879b88c09083695cdc2bfc8/30151988480.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ac685b04---gitusixudigelape.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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 10908 bytes
SHA-256: 7a4d2975e018e7561d4a2f60f024e1d680acaf017160b75f9168b1881d634238
font_01_sfnt_off000106da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DA 16792 bytes
SHA-256: 5bbcdffeaae51920ca04a019c7bb360ee974afaea928fa64af63083e9ed23580
font_02_sfnt_off00013206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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