Malicious PDF — malware analysis report

Static analysis result for SHA-256 965473422ccde49a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 02:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bcacd6a8c59943dc8ecccdfb33a6683 SHA-1: e10fce342ff1c9a34d9c26c64d5a81851b553daa SHA-256: 965473422ccde49a8c503eddd7f67326361e7ca633e4d1f160e311dfac0cb2f0
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=minecraft+download+mcpe+master PDF link annotation
    • http://ruiqingchem.com/upload/files/12172227025.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/zotanamobubasesibaf.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a57ccb8d299f4729c24e20bed745f351/56295546010.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/kikekitozokesarurademaper.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/65436125011.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/zulixaximirefip.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614742af8c35c---vufugovelasutijazetavol.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6msvk9bo21shv4bmi2jqu6tmg5/25621524459.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/fevasim.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210912190518.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/79890604283.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/39072963643.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/2084425843613c36d38567a.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/a2828fe98ea146bd7d8d7755133240c1/39426641216.pdfIn PDF document text
    • http://amkchem.com/upload/files/35476342542.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/totajig.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b498353621---38478401685.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/68845162283.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/fopadifag.pdfIn PDF document text
    • https://kueapem.com/contents/files/tewupobovelijojaxe.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b1b5d82d5---99394762111.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/48844631256.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/17395604698.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/duwuvawubesopeve.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_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FE 17600 bytes
SHA-256: d5ee25250ef99a172a73212ae61d047192fa059439ce6e26791d0ea32d5f8ede
font_02_sfnt_off00011feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEB 10860 bytes
SHA-256: 118ea6caf8a99579a110c41a64ef2e4b469767dc2145f0e52029a4553da52dbd

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