Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc0210b8009abea…

MALICIOUS

PDF

83.2 KB Created: 2021-09-04 09:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e9483cff80051b0d9bd32a05598949a SHA-1: 7a2675b0d4188c849b18ddf54e06a4900bf583f1 SHA-256: 0bc0210b8009abea1fd4b6b51caab79ea7cdb14f3af532b248c95f53a8024f2e
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many pointing to potentially compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d85d06879f7---modukuvumafonikor.pdf In PDF document text
    • http://planbmedia.hu/files/vogis.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/bogugevalavigujutusuki.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30ce93cd25e3b25828f578afb178489e/21696001458.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/22475396467.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a89d7ab5cad841b6dfab98686de6b840/zobono.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/xibavaponugebagewal.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/r0f2vo1ofsi1a3o59d22m00ver/51852122923.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61397ecd83---saxabunizubugo.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/27476246709.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/bekifekasojokupizasal.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rotugametavumekaj.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/93893042581.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/33073993074.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/74112411336.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076b1a36e78e---88517820538.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/45633080894.pdfIn PDF document text
    • https://ka-base.no/images_content/file/jolofowunusolowafafojop.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/59137234308.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/22690043463.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/17238176084.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/wetozol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=black+decker+workmate+300+manualPDF 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_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 17540 bytes
SHA-256: 36eb9e988781125f27768ec1b9273e20407b7100e4378ee81ecad02ae20b851f
font_01_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 10896 bytes
SHA-256: 8042900f9e3810b37708f2f86d4b27bfeeb28b4b781f6fbc6b857293440aeb3b
font_02_sfnt_off00012769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12769 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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