Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8b8e68737263168…

MALICIOUS

PDF

94.8 KB Created: 2021-07-02 07:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 954d2769ab38129feb869c9f6570776e SHA-1: e231bffadc92362db5d5095cd652719e735c6eaa SHA-256: c8b8e68737263168e512b787de01ec4a6180b14d49bbc1e1e7545dc5f4460d99
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the file acting as a link farm, directing users to various compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest an attempt to redirect users to phishing or malware download sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=if+you+are+29+what+year+were+you+born PDF link annotation
    • http://creaorganization.com/depo/sayfaresim/file/84092825522.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe74759f88---jamuzovanopodaxoto.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/bd69kvnf9fjtjnvled1liksg7t/nejeleme.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/11drs2fngkpnf479s4u8sfhlgk/livok.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160b49486cb11d---favosimokajomegawexu.pdfPDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160773472d6b55---76942818436.pdfIn PDF document text
    • https://lncl.org/ckfinder/userfiles/files/bisikoka.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rjd9inlbqpadg1fb20mspjd9ps/46099672937.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/zotelezuwusavibumubago.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/12470450999.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/22407841443.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/q0rkknrjsai1illfab58n4qcsi/dumawomal.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/119d4ff835e03ee7f5f5f6f6da971967/73394253177.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607140d12a24d---sutafekuzovoxis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607777cfc36d5---56422449926.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/9sbfathicdde6p54g5nkblllot/83153781029.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/wowuzovemefalesasume.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/b9oibng4cb801cuu90p2r0h817/16557900862.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/85900852504.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/45fb792c740b38eec52c9be867a59b24/7906210108.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/8b22a535a7f024fed64cafcae4e1ed69/85816042838.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091ddf420a21---jagidudilob.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b530aec353---vowozu.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_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 18012 bytes
SHA-256: 90a47b8fae6429312a55200bcadd705536d14839029be675365b881dbcba20a3
font_01_sfnt_off00013b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B64 10684 bytes
SHA-256: 9af3c811e41b39ded4c06678f03dc2746d895bbc0ab8334f815db776f17e3ba6
font_02_sfnt_off00015403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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