Malicious PDF — malware analysis report

Static analysis result for SHA-256 6619ea34caf2f660…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 06:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6f0e6e12f66e33423a2aa698bce3868a SHA-1: 94a7e271219b33feee7e3f8fa1a92dade0ce75b2 SHA-256: 6619ea34caf2f66076e4c87266a2176706a8f08dabc8cb15621cab82babbbe01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF, as indicated by ML classification and ClamAV detection. It functions as a link farm, directing users to various websites hosted on compromised CMS uploads and disposable domains, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=angle+construction+worksheet+pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0e8fbf87c3c72cbd025cfeeaeba7e07b/xusafoxoroge.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/a413422e458e5d5a9f1ca0b6407fb886/37369195996.pdf
    • http://aklond.com/UploadFilesfile///2021051602500229.pdf
    • https://kovosluzba-praha.cz/res/file/vegotatowawuxagok.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/cgpljjrv5s73v8to13j5m0pp25/60017888286.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f083db3b4e---wukokuvupilorovumokedo.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f4006f26---33768123326.pdf
    • http://kipia-nn.ru/userfiles/file/65721820113.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/od7g5qiunnsvldrj945cbbb416/robuxogatawegakepi.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6618e21c2---42860736220.pdf
    • https://ludifrance.fr/userfiles/file/kikomorijipowowedokabifin.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8c6d8d14---nerejakuba.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c085b8d4a---fafifoxefevaxo.pdf
    • https://livre-art.com/ckfinder/userfiles/files/noramu.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f78bc3afb3b---81244710096.pdf
    • https://idealist.ro/userfiles/file/ruletemirifirobiretapexe.pdf
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/melur.pdf
    • http://ipllaser.in/uploads/19179911713.pdf
    • http://tevukasveza.lt/ckfinder/userfiles/files/30980336371.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740fe86c511---pexatogewobov.pdf
    • http://ajivikafinance.com/userfiles/file/60846175309.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbef8cda411---36753632162.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833cb732262---44355791458.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/0a43a07f7da557c082ad5ef510eb0650/60454946018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de38.bin
94265c0d29d81564e7c78ee0e15a290afd1a36c7f2289009425cb79fd4d97486
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 10996 bytes
font_01_sfnt_off0000f79a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 16792 bytes
font_02_sfnt_off00010fac.bin
90816919525a122691893716f8c88bf3f4e2bb79a16f98f0d1d699fd26fad8a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 17496 bytes