Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a16fa0b21d8fd2b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-09 09:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 782dd48649c94a6894703b6c93e5daa9 SHA-1: 718ab85f279ce739e28c07decdaa4994abc90a32 SHA-256: 2a16fa0b21d8fd2b8d36565bb07160574648042350ece0ecb09341f33bd358cf
156 Risk Score

Malware Insights

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

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 multiple compromised or disposable domains, including 'inwebjor.ru' and 'louisefarmersmith.com'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://inwebjor.ru/uplcv?utm_term=galaxy+attack+alien+shooter+mod+apk+download PDF link annotation
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/54654385782.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161315cf4acdd4---xaporifirizox.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/99230035581.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/b660c01dc14fcc8ca350397407010b3c/mutovowovepezi.pdfIn PDF document text
    • https://tessuno.com/upload/files/61399916a3a85.pdfIn PDF document text
    • http://kaies.net/upfiles/2109072317146850013egb02.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/guguzu.pdfIn PDF document text
    • http://secoinblock.com/upload/files/bupopowadelavi.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/22535212147.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bc4ab0bf3---37441312161.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/51381121125.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/89525557667.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/83258228368.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/157291eb8ef67d830cf540c7379ec094/puxav.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/tuzud.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/65079139607.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/25642294798.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4253af33b628ae935b689f6adae9b3ca/jewobenewexad.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a0f29d8f---66699568876.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/litimalosokibafudez.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/28085944341.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/64181000191.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/fegexudunulefisejom.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/sixifasipisevigabaxopupiz.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/95375522044.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/37065113188.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_off0000b8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C8 15868 bytes
SHA-256: 830c59ae1ddcb5d9e85a096ba565720d9767d880a4b38e63bcb9adde864b0d75
font_01_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 11212 bytes
SHA-256: 4b7c95dbe627a47a4636e7fee2020ee7752ff8dfce18138cc9da3fb7466ee0ee

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