Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b387c9de279653…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 11:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9bf5413982d01262790204bae0f90003 SHA-1: 90da347fdb7a482b9b0ec98f37295de065aef673 SHA-256: 41b387c9de2796536248f730abaf58922eacf2f8f706b4d1d0da46060757bb9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=bumper+man+game+download+apk PDF link annotation
    • http://metabolizmusonline.hu/images/upload/file/bazinefimedaluzewilirexu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8e2181a99afa5f7505838862b33db6bf/93132384856.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/771546328.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/notab.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/30776674921.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/neguzudi.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/59419739550.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/33234020209.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/42767178138.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/99896533227.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/58669169314.pdfIn PDF document text
    • http://trovas.com/userimages/45507276962.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/69772868098.pdfIn PDF document text
    • https://dacola.com/upload/files/72863548169.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/kekewizirovajufugamenu.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/tagadupaworazo.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/15336684060.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/nemodijuvi.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029997ebdf---zexijuwopemax.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/lulisudemobezax.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/jineveda.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143ac92416e0---tisovoreper.pdfIn PDF document text
    • http://panova-art.com/files/file/modes.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/zajojatu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/jekozulunafa.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_off0000d8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E1 17784 bytes
SHA-256: 9dcac0262c9e377370983390cba25cf01f267d48d19f312839fa0517cd592f43
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 10708 bytes
SHA-256: 6ebf06b6f4e233cd3277c61e294121a524f738afa1af260ce7b2a908392b62d6

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