Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dbe68d5c05d33b…

MALICIOUS

PDF

124.4 KB Created: 2021-08-02 22:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38a694ca62a8ae1770e2368a6bf51aa7 SHA-1: cc735b3ef5cc7e0cb5782ce3b1eaff2c063e5963 SHA-256: f8dbe68d5c05d33bdaa12a9d6015fb78f369bdc5d44b6dcc21c1f567ce88e74f
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, forming a link farm. The embedded URLs and the heuristic firings indicate a strong intent to redirect users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sukhayurveda.in/userfiles/file/93584644862.pdf In PDF document text
    • http://podushka.by/files/files/lagipaluz.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3146a33e28---83897163221.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/7eb934fce5de6d9736d4f1d0483affa9/popop.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/2977137903.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/74287191906.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5222112fb9d4e8c1dde9f5b3d85c1443/11128981503.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/regjk83i6uink7gbbaruraea42/gilebunulifer.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/metilumesusa.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210604110935.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ed5ecde1---45973065680.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/def0493fda4e41bd4c416a925746906d/nuragavumakunix.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/bfbed1f803518f4e54bc3d6d17f32e04/19613890079.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/e004f05835726a8582e575db13de609f/17467493786.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/21115312505.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0b0110ff4f5bd291230240d33a5d1f55/nokipufekewoberufifiv.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/15142566971.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/naminoritaxalijulovapaj.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/87t83qquihdmje31gef3b66qib/jawirokutejuzuzolebore.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/loludelevevivan.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f531efe5---97444668377.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/51258209612.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ddb0dfea---42743059353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+reset+a+maytag+commercial+dryerPDF 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_off000182b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AC7 10800 bytes
SHA-256: 977974a5ebebb39ddc2f55b594a6b02a30b6ab9d81ad513d96d95c5287a27ff6
font_02_sfnt_off0001b390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B390 18112 bytes
SHA-256: c8bdaf02f03e810eb27889be399c0b64769e1e0c2ea6a544c8160b381b644031

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