Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77dbe47ddf83b6a…

MALICIOUS

PDF

88.0 KB Created: 2021-09-20 23:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62340108599b297512a8affbe0d842b5 SHA-1: d5d560653af043bee976e7fd8e6107f852aa84d1 SHA-256: c77dbe47ddf83b6a18b38e3e230f08a9188ee5f128a117a6701f230ac22e548e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://solturism.ro/images/file/magegisitokamosesu.pdf
    • http://everestlodgelukla.com/userfiles/file/jutusorodojesedewe.pdf
    • http://vuoncotichdep.com/upload/files/66595604894.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/96538578496.pdf
    • https://heatingboiler.ca/fck_upload/file/gibemaxur.pdf
    • http://goksirkrupskimlyn.pl/img/upload/files/26444635907.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/4kith7ihog9f1a6qo3435kvt10/xovojaxarux.pdf
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/xokinu.pdf
    • https://gerbangkuis.com/contents/files/45650451795.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/1dbfe84f7b36d04caa3fe78d907a23c8/tuforixama.pdf
    • https://fceresources.com/ckfinder/userfiles/files/81622816105.pdf
    • http://fujiya-la.com/uploads/files/gabiwisamivi.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8bef4e08f---67778681654.pdf
    • http://controldellaves.com/app/webroot/arxius/file/zogix.pdf
    • http://rencontres-icare.org/userfiles/file/nisidoseripoduwusuzuko.pdf
    • http://euro-ex.com/images/blog/file/56483998052.pdf
    • http://flapboxes.com/userfiles/files/walutivogadezusojuzodemap.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614801d8d0cbb---fojotowewoborijik.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d430e840f8---87065803709.pdf
    • http://americasbestwingspa.iorderfoods.com/uploads/files/48443235591.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lebufevani.pdf
    • http://dentalweek.eu/userfiles/files/kuburoxo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=anime+live+wallpaper+iphone+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f462.bin
18b84c005d06764a6d1a9b78d6f73ead67121b7c04105aaef01385ad91825c20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 10492 bytes
font_01_sfnt_off00010bff.bin
749d2eb85cd351ce5a66ec188f015097050fd305acff452e143e8d55f0856246
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 17704 bytes
font_02_sfnt_off00013a33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A33 16792 bytes