Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7d69507f9457bd…

MALICIOUS

PDF

80.0 KB Created: 2021-09-16 05:03:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a605f4de99219dd3c9ab402ce6d4adb4 SHA-1: 6433074d48752ead7354fc6b21fc2e6b454265b0 SHA-256: 0b7d69507f9457bd56db7c8e187fc95df53c622888e65df85c6e5f690b93d032
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://smidgel.ru/uplcv?utm_term=gta+san+andreas+apk+2 PDF link annotation
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48523343722.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210907140241.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/fajese.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cb1d5fa9---xusagazun.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/6208658209.pdfIn PDF document text
    • http://datcat.vn/2018/file/vigesurem.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/72326634327.pdfIn PDF document text
    • http://tochalco.com/uploads/files/jusat.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/mipemepetetuzejaz.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/87777627812.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3ebe7b72e---60347864131.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/berukazapu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/80b920bb43cad7b0b0fab3de847235bd/70081245702.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/jumisepixatase.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/ribugawinelesuf.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91824c60d---towana.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/aaf07226699f3c70218945e0461a465b/14732580333.pdfIn PDF document text
    • http://dentistturkey.com/image/files/53783244787.pdfIn PDF document text
    • http://bamor.org/userfiles/file/puvif.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/tazunifafoliporulewimu.pdfIn PDF document text
    • http://ymmicro.com/files/files/sabelibasozurejusagujev.pdfIn PDF document text
    • http://toszegisuli.hu/userfiles/file/lewafeg.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/12286359876.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_off0000d5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D3 10376 bytes
SHA-256: b605554a601dcf7afb8a2e1aa99d5a1655bba9a3dc419d51132ef3a49943355f
font_01_sfnt_off0000ed81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 17384 bytes
SHA-256: c33c4c0d0180c78d0dadc0fffd6564247b813355c4960b76f46abd7ef51cac51
font_02_sfnt_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1