Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edfcca80ffbbe0c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 08:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: da5afee5f582c39c98e94295e9c78ceb SHA-1: d79963c09319665d9f5a448e67f6b64d8586d042 SHA-256: 6edfcca80ffbbe0c2fd7272c7190daf95b3892089a211402e2e0f894e6d1ee57
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The presence of these elements, combined with high-confidence ML and ClamAV detections, strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=convert+word+file+to+pdf+free+online PDF link annotation
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/052ebf3f9c713a3f6d50f7104dcfd063/48502373033.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/disajikuku.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb194733c4a---pejulojavaganisaditujo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/7ajpk3400kus3kcb0geldlmkkq/kugajaxiw.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/28944044139.pdfIn PDF document text
    • http://damutech.kz/upload/2021/08files/210827231003701645fsz8g.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/a7e72cf968ee151c6b874e27e0a4a808/luvuvevezimufofofom.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/65219546823.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/aff240ef94777352f6e121d792719932/83649036426.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/27619619970.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/57303368664.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/xibevozininiw.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ldn1ej8203lm71vopkg5iqt045/21957661649.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/fawopu.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/xupisat.pdfIn PDF document text
    • https://chptravel.ir/data/file/faxowojotud.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/pefodefoxagewexuvelo.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/45585679265.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cc0c1aa26---19370226491.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090621455570622.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/siworexon.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/8d6ca660a565d2b2ec0fc0205d084557/sorozojerofo.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_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 16832 bytes
SHA-256: b4d13941c16d700e01e0d696dbe35864b6840e3b0b0f2029bfbcb548547bd590
font_01_sfnt_off000104f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F8 10344 bytes
SHA-256: 076ec3616f63fa82de43613b5ee03d764c128ca0a24c5fdc6be913552612a6f2
font_02_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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