Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e72b61ce9d14946…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 13:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e869582ea2a9c79ef08d78708f830f0e SHA-1: 371bcdedbc414e9d284233ccd3afea54f7cb4723 SHA-256: 8e72b61ce9d14946070266cde427e94140125c019739d960cc02de370a05dfd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pixomot.ru/uplcv?utm_term=android+app+speedometer PDF link annotation
    • http://9275522-travel.com/userfiles/file/53899116858.pdfIn PDF document text
    • http://baoveantam.org/upload/files/fimemagejofadafepi.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/49984511569.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/69051068536.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613db14a1685d---zaduridobin.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/lirebisatumovadafag.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/fuxolazuwenopeke.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/98335981989.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/dijixudibimezaxakitogaled.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/84261946673.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3b70835caaea43a4fe06288f3c605db9/xuwunumixo.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/kazuletumi.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/gowuwofivefetisu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/u1unee6e9nkuu4jbjmj3v635bs/pojisewukojimi.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b287123f8---84709252586.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/dunabatajoroxom.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/3174844451.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb59321bed---57729766865.pdfIn PDF document text
    • http://vlajamo.cz/images/file/72394896508.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/t19g5s3pip738b6c9fpdrki28e/wutululomerivejebe.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/pimozolatix.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210901_10133A5C0F48DA46.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e21244df7---95004709475.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_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 17736 bytes
SHA-256: 4585d6c1380ee595108faf6d1f37054d36d2c06fe90cbfd9fe6bfe470d2fc5f0
font_02_sfnt_off00013561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13561 10488 bytes
SHA-256: 083c7d22054eddece3ecc0a67ce2490bb405eace19a9e5b06871ef30faffa96d