Malicious PDF — malware analysis report

Static analysis result for SHA-256 a94119dd8b4e6593…

MALICIOUS

PDF

84.6 KB Created: 2021-08-16 20:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a38f932adb7155316c4426da80f82d69 SHA-1: c0bdbef47f183f9d8274eb044ab2d387c08222ca SHA-256: a94119dd8b4e6593f0981e4437cb7e5ef9d6fc90bdd6b95eeca8adf1af295db2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a downloader for further payloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=how+to+reset+epson+l3110+end+of+life PDF link annotation
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/84064910846.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9e9cc44e6a1a6f5fa91ebafa269d5104/27955215641.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dda9080b1---kugusasu.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16092efb0a2a6f---dexalo.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/ruzoxorimoko.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/37624235319.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/68561124327.pdfIn PDF document text
    • http://ruihuitax.com/files/file/zoguzijowanixazatedaribul.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/nonuzojekawa.pdfIn PDF document text
    • https://majubesar.info/contents//files/80230399058.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/wajafoxutefivijumox.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857a7d2cdb6---fubiputeberejowijo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160909d04c40e3---82167403842.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e62cab15dcd53c5094cc7fdef9a4333f/11800239854.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/95465379448.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/28695841974.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/51876317905.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/polenoruwelimofapiliwalu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/88d3ac33d04d63efa9606b4ca3bc4ed4/32845977305.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/vugurozusiwurem.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/41364837082.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e7dcc3a3b---89362393090.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/39147250302.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/jalamepazekukuvotatigamex.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/joxazunaporozobibolape.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_off0000e5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBF 10752 bytes
SHA-256: a4f25daffd16c66093758c8c305d62330127a208802708ef6ccf01da1072bda9
font_02_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 17380 bytes
SHA-256: 6bdadc71fdb5fd3a2a956e25293b9a60de291d9635e7d9cb609a8fa180dca04d