Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1b8b4add0915ad…

MALICIOUS

PDF

71.7 KB Created: 2021-10-02 23:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0248fe6112297eda5f66d3d9d054f308 SHA-1: f863ed3264016f6693bc18a5cf4759e639167bc5 SHA-256: 1c1b8b4add0915ad1f7062c2272eab49e460afb538749f5d2c8b105756fc7931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains or compromised WordPress installations, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=potentiality+in+a+sentence PDF link annotation
    • http://autosoftware.company/autoresponders_images/files/sipajatedu.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/lubowemibebu.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/32839528928.pdfIn PDF document text
    • http://vkts.se/userfiles/file/mewerogasatugoxelegenolut.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/sixematanaxifir.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff64ab08c8---54866940430.pdfIn PDF document text
    • http://sissonne.hu/editor_up/lipar.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nolv7vmct5f57kseikp7ak7m1o/tajizukusojubegabe.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gakfihhihv265cgqkkhb8lihmd/figikovagalofamuxanujux.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/26730293723.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/18247505294.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/81664520307.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/65859355748.pdfIn PDF document text
    • https://paysecure.ro/ckfinder/userfiles/files/saxoxukegun.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/83757566005.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/bujama.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/65754979008.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/zolimaxonupo.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/vedolon.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/67364618212.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210920_2B44D3EBA31EB2C2.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/63447962386.pdfIn PDF document text
    • http://msiutilities.biz/documents/45339336599.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/nosazawovedoregoniluwozuk.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/nalevevulebovizejipezi.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_off0000b501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB501 10236 bytes
SHA-256: 9c192bfcce81bf1185f810ee7c074bc35a95b1888ab93807a92d82194fe7550d
font_01_sfnt_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE447 17464 bytes
SHA-256: defe478b84b5ec84241ce5002e1634a2c3d909ea400240cf1042523f60449830

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