Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf74412db96d865b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-04 04:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 79c470d293daf2370b8bf1fe29b1ac49 SHA-1: 5534275080c385a73e51a811e0a7c14d427368cd SHA-256: cf74412db96d865bf4c3029d5863c2a79956e42a4bb237d90de326238770d772
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://myphamnanyno.com/luutru/files/71175404695.pdf In PDF document text
    • https://foundryindia.org/userfiles/file/wuxorelobuvowonosoli.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/xoxofo.pdfIn PDF document text
    • https://combrooncom.com/contents/files/wolaromamaxolap.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df108f45c---besetobaxarewedawanokoje.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/368b66d5837da9b51b4ba38abfc20a6c/jesetidugulakobedazazufu.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/16ef03ea37b2659fa4856d9ef1eb8c55/kegiwenoboxuz.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3900b5568---nisumitugaxagiladukolijub.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/9641141210.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/75974136740.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/febipixomikinederuki.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/34958595503.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/33934433145.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/36885600497.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/djvkuof0nsr7lvq7nqppejdt2e/21275095823.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4cef6b7d30cb39bfa5b0b2db28530f8/97245858170.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160888c7b939a5---savib.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa81d115798---38167447162.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/vonapapedekototaneje.pdfIn PDF document text
    • https://educhina.mn/editor/files/guwumewitukokijugumotes.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9coh7ikaqouq76fbisoahhd0c/92629678748.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47beed670b---75784420963.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4f5ea11cb1---40650081686.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/15168544956.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/12749597907.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/sagapuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=spardha+vijetha+magazine+may+2019+pdfPDF 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_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 11516 bytes
SHA-256: 56ac537fd00ee18d62ccc51175728ff3f0dcd1225b9674e2c4541af43fab63c9
font_01_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 21348 bytes
SHA-256: 5db2058892bbafe88f07374bea88fcd71d62512b162b5b3221b847fb805b91c2
font_02_sfnt_off00013d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1