Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb111c38882473d4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 13:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d616931b758208b8d1fb66456a47de1 SHA-1: 3fed9a9e27304990f0c0be39a2b46ad775f7b634 SHA-256: bb111c38882473d4f1e34ddf32f70a158761db32d314d649907d7009a8cd7a3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

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://catamma.ru/uplcv?utm_term=friv+games+granny PDF link annotation
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb1dc09d---92208257605.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/35064117465.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/46250023653.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210913025023.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa0806de76---3739601540.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143845f35c76---jixagumekakanelejale.pdfIn PDF document text
    • https://ms01bet.com/contents/files/damiritafaletesobanokudod.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/3a13f51234f7300ad8d92546434fb8cf/21198866812.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161451c33d6fb0---jujejagasaxuzez.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/09e81b149a9830ef2b809269bbc1fc61/84955918474.pdfIn PDF document text
    • http://camonetinternational.com/files/file/zilusabamud.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613be06d301cb---4565464372.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/girejabigefu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f1488f88---27939708922.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/24354455350.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/kitowegifol.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/gusogafebuzuze.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///pedamuzuju.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_off0000b62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 10344 bytes
SHA-256: ed7c4c57118fd1ce8d2dbe00fb2a656e765ef9339227233194b34fb2ec43835e
font_02_sfnt_off0000e58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58D 15968 bytes
SHA-256: 3098e3e7ea4e7776a7c785647e463edb355c8df93f35e8a38f79bab427305fe5