Malicious PDF — malware analysis report

Static analysis result for SHA-256 07d4fc5fa7316da7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 16:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e011f4385d4a92ce4303a44a48515ade SHA-1: 782f5a36f746763f0f36e807da0ffda7e4be65d6 SHA-256: 07d4fc5fa7316da7ceab02ec175d95b437112cfda8cb1fa49ae7e7596c58599a
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to prompt the user to install a browser extension or update. This suggests an attempt to deliver a second-stage payload or steal credentials, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://cafegreenwichvillage.com/uploads/files/gasetopuxoxozobibop.pdf In PDF document text
    • http://isvpro.com/custom/files/67194788754.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/47245556869.pdfIn PDF document text
    • https://buyafranchise.org/files/files/37676236860.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/5434996364.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/17206619405.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/vijimonexijukanuni.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/37cd0e1ec9fee7487135fa0c51b01860/defodovebenufisezi.pdfIn PDF document text
    • https://rosycaffe.com/file/zixonujedenudobulogisaj.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/luvuxugomi.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/18846494267.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/13836310080.pdfIn PDF document text
    • https://anakmeong.com/contents/files/78730026163.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/30515675439.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/41148781327.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/ropalijarijetuk.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/885027376.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/sunedexedugokit.pdfIn PDF document text
    • https://masukpt1.com/contents/files/dogemekimokovapino.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/doferulosipefaviw.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/va7mpujbsg7l3m58gudsjrkmm6/kibedasoxidiwunesarag.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/musopamebunut.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dfc677927---zosidadusiranad.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/netixozumonoguwa.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/10127270423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+do+inspect+element+on+androidPDF 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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA1 10752 bytes
SHA-256: fee3bcd48f2c30c3e4e3ad59726fda4b47c08c05291c697e325f08f3cc3fb3ae
font_02_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 18476 bytes
SHA-256: fd431064d66ffa4f1b73572180ac57f1208c6606a671f7e59ed4dde06e24cb4c

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