Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa68f41dad84135…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 13:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e603be90a90f5d01c2b8ad0754787b47 SHA-1: e807c39e980ef4f43c34585b88799f3463db5600 SHA-256: faa68f41dad84135717647e4a818606c2f571fef52c64a60f34d26108c541a36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to malicious content or download further payloads. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users into clicking malicious links, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=unit+1+worksheet+2+significant+figures+key PDF link annotation
    • http://abwingssuffolk2.com/uploads/files/5809914487.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/61628143357.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/64ce840ccb0a0b32889641c8722a436e/nitodes.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe55fcc4df---digufiwejazizafoli.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9feed14c2a69dda8bf163d29795b4043/wefexibugo.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/vikorutegekivi.pdfIn PDF document text
    • http://darec.sk/files/files/94974718014.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb68d76ea6---61639547989.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/rofuzigufajerevokujagabe.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/et88t1gljica67cqh96925fuc7/vafogaxukuwewabegesuvabu.pdfIn PDF document text
    • http://hookmyweddingup.net/clients/73542/File/jeraxanoxak.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c9007e97003---68161571170.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nazafatani.pdfIn PDF document text
    • https://bursac.net/userfiles/file/97491689913.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/385c664d51a3a2d81a56c9791ec16296/godoranewasapamivezuforev.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b5d4a0dcf---fekuwe.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070c696aa92a---tasilew.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/vederemabosipufiloj.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/941q38hfl6b2k073ecv4gghu8e/32674915765.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/81821283350.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c24330376bcba2aa313ec514f30c8c2b/gudugepupiviletamopu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49bd8c3db---22916235640.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/fivimava.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_off0000c38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38D 11140 bytes
SHA-256: da31e9e80b43281881b181630748ae18553c5fa03ebed7dfc572fe2c812dbb5f
font_01_sfnt_off0000ddc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC4 16612 bytes
SHA-256: d0abb7b31bca7e53cb60604637bababc1b53a10826192effef647e38702778ba
font_02_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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