Malicious PDF — malware analysis report

Static analysis result for SHA-256 922d29e3bbbbd4f4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-14 09:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1782ea45346ff0ee09db333826fbe350 SHA-1: 679e274f6411e8ff2c4e1f2463aefef4196bf8fd SHA-256: 922d29e3bbbbd4f409f055b413a97ecc2463cedd8e7ed93a2e10a57178306049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=streaming+harry+potter+and+the+chamber+of+secrets PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334fb186934---madikupojurexadew.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/6710490377.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/30548925996.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/34372259.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c671d921d6---39690897077.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/simafuragebowiwuzanivajar.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/pebarosekedusedula.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/44d3899ba5879a4bb026b86872de0ff6/48967392883.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/niboreniwedabotobukomu.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/86183767258.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bisurubinetazezijoxuzivi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906002652821574.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/binatukotibepozojem.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/minuxaxug.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/sakipurabizoruwaletubu.pdfIn PDF document text
    • http://atrsara.ir/resource/files/kinemotadaguvekisusifeji.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5c8053adb8ad90381016b895b597f3cd/62545346912.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/figamenifoxel.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/93703683038.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139e59ce1361---19891045507.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/79905859358.pdfIn PDF document text
    • http://master-vin.ru/files/file/61743673860.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/sijolidikomebuj.pdfIn PDF document text
    • http://cobmedia.hu/include/52478093285.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/81332654269.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_off0000e6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 11352 bytes
SHA-256: e522c42a5f66640ab0d87e25845dd24be336537ee97f3c38bbb57fc1466d84b3
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 17924 bytes
SHA-256: b989f4bef2f17773e1cf4b82d7808ba7d30ab73d8d99f016e9d5d979d6bea938
font_02_sfnt_off00012f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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