Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16bc0150ff8e1b9…

MALICIOUS

PDF

85.8 KB Created: 2021-08-29 21:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a76fcc8bd4089b26fb47326abbedfeab SHA-1: b5101162feb1fb6775992a8e81fab6cbd0c6b782 SHA-256: f16bc0150ff8e1b9bed626f110c43ff96ff507dcfd7fd3ba2ff6243dd19e95ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://philabc.ru/uplcv?utm_term=inflammation+of+gallbladder+treatment PDF link annotation
    • http://sammyurias.com/userfiles/files/67132907522.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/0a8d4442dfb895794d9304598e9d7f84/rigijodubi.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/tosemefakufaperife.pdfIn PDF document text
    • http://slsnn.ru/content/files/41707772093.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab3d9c9dcf---28691557548.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/5c74d8b2018290a134b7ea38bdf52257/rupexudizaxanutixivi.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210726_4E7437681B2A669C.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/43850206982.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/98d143b1baaf9347c0ae099c8aa5c3c7/madelaretuwive.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/vibexoja.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/julufibugibes.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b6312697ab0---vufirexo.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/kefimabukotafosoxop.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxofegenum.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/2gubbpb802ivn3iri2utgn6k0h/94636769768.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/zinakagidupu.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/rejupalik.pdfIn PDF document text
    • https://steammining.com/userfiles/file/vigivifomosekaferapabov.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1a7a07107---jujimi.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/94764493222.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/bepamiwulekidipavovum.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f8af1f979---nevun.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_off0000eac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 17676 bytes
SHA-256: 710c55382cc0e53228023cdd0e1123d265da102243a0965820612046161ddb9d
font_02_sfnt_off0001309d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309D 10620 bytes
SHA-256: 7d4e42e931ba7476000e76baa829cd8f8348f6f6ef5d483a9f71f10aac6324a9

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