Malicious PDF — malware analysis report

Static analysis result for SHA-256 723bec4cb9183a5d…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 20:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e994b91bcd50e595057f6c32ba9271ec SHA-1: 62082bb73c30f058a92eb1a3728f7e9e6c793f8e SHA-256: 723bec4cb9183a5d06d394c875fb6ddb15f2f62d8a725cef3c730d771cf7b746
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fruhmann-elektrotechnik.at/62908717633.pdf In PDF document text
    • http://101-games.ru/images/uploads/files/60620686872.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/jolabukebizadawa.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/lixoropuzageguwo.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/dikazaxevaxisober.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161469e720612b---10124041022.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/poziveniw.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/matesasilaju.pdfIn PDF document text
    • https://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/zovogajidasimajadojet.pdfIn PDF document text
    • http://sbcnepal.com/images/file/38638166483.pdfIn PDF document text
    • http://bresky.cz/res/file/78231200130.pdfIn PDF document text
    • http://falerisztika.hu/tmp/26099914555.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/fipejom.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/62210221347.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/8087419608.pdfIn PDF document text
    • https://primer-spb.ru/files/files/27013974272.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/2633379958.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/87068935653.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132515da1fad---rurafizip.pdfIn PDF document text
    • https://anup.bo/images/files/regonepidededizejirus.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/66076a4392377b63a00c818032598986/pikajelotojebisibodadubi.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/kexisiledija.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109070244464566.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/sudita.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210922/2043256100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=zona+free+movies+apk+downloadPDF 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_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 19608 bytes
SHA-256: 29acc369ecdb606b22dc6350b25b51d4edf8ce8e19174a8b06b0045916743c2b
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 10768 bytes
SHA-256: cf3841c7c1b9f9b1e09f9edf1868a63c4127a57c3aa59230213dfdd26807f6b6
font_02_sfnt_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1