Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccdbb94ad07f0d9b…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 14:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2695e91e469cffdb62dd115c5fccbb86 SHA-1: 19bf374ebb98eee1b79c6c3be0e634c48c40bfef SHA-256: ccdbb94ad07f0d9b1d50c0da66324988b105dcb12c80c27bf8f800c5d4479a01
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smidgel.ru/uplcv?utm_term=arcore+flutter+plugin PDF link annotation
    • http://olech-rzeszow.pl/userfiles/file/71852823204.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/xamolelikebewikofe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab3ef14c2---4375922016.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/20f49471523b5a8b8378119e1abd84d2/47306674222.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304c62bac92---52375055185.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109082045403374.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/fopokopezeparajudodigusoj.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133350a55148---weposof.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/53069781078.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/92003458714.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/subarikevebenev.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/75768587154.pdfIn PDF document text
    • http://test-immo.com/file/puzidod.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336fdd03520---43487465029.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/tawara.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/73856311919.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/56223176286.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/xemowisizelugavenonumora.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/fidafe.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/vudakovaboxenebijure.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191153101718.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/67198365876.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/mozaxofuwo.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_off0000b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 10404 bytes
SHA-256: 2f33320fd2fa9787f7e77bd20e751614c8a1ffde2e4e8fb9e7fe0bcb76948dc4
font_02_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 15224 bytes
SHA-256: 76da120bdcdfd69904efa44217dd2b402d62a3737063baebf16019b58b1e0b35