Malicious PDF — malware analysis report

Static analysis result for SHA-256 383ae8d11d67b964…

MALICIOUS

PDF

101.7 KB Created: 2021-08-01 02:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b5839538b26c3b5854f21e7dfb9bb001 SHA-1: c35c0173aa769b2113e3cb4db50c3678d985c5ef SHA-256: 383ae8d11d67b964b01eac990778d68b0f26f822ca8c4f8a2617810ef50b8c83
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://e68momo.com/shopadmin/upload/files/xejosalosurowudokob.pdf In PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c0c4b9be4---44971985115.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/1130521003.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/22a6384f194decbcc2c7789e390bec18/gizonuvuvifiji.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210617112825_509248346.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b9f0e316948aa6969c2dcac75bf03317/51810572610.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a257ca9d75a---89447560866.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/xasuzawo.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607622deda8a8---88553162922.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/natevu.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45f1d2f29---lusasoruwosujibonitojiko.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/7680d1ab14e8895e6e6dd1e4c9f1b9a7/xibududobeluxoxuto.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015f671a21---90850165620.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/kiraduzewipusavesalimigej.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//zaxizamenugebufanat.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/keralewitumerowomixuxi.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160904aade2192---dupati.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/a0c802d2ee6c29391167fd4d6f36c3b6/47928971618.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/nonuxevofidipez.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8640a83ce---46254658949.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/77521148537.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/33196835108.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/lanixajizewudefurutuza.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/nvhcch2hpf8gletvlr6vutq241/suliwanesunumus.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/egtq3got6hapnoo417i92b2jlh/jasonuririwapajidenumuk.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160759ffd50574---xerowemogederafarafajinim.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/8290839690.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=riley+ak+47+manualPDF 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_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 10264 bytes
SHA-256: 76fbc884149c8899814ae7ce91b17ed19a8180937368d434700833c97183768e
font_01_sfnt_off000140d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D0 17972 bytes
SHA-256: 9c8082980596d912482143683d5507724ebcf6ee29f0329fb8101c2f89d6ba58
font_02_sfnt_off00016fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1