Malicious PDF — malware analysis report

Static analysis result for SHA-256 caec12b83b9b52ca…

MALICIOUS

PDF

78.9 KB Created: 2021-08-24 23:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0cc0cfda05ea7a4852e9ae9314d1768c SHA-1: 6db4fcd93cef5e3220d81ab123fea29f5bcc2882 SHA-256: caec12b83b9b52caadcd395c2735cd797932f997919467712e705b0460ec16b5
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to other PDF files hosted on compromised websites. This suggests a phishing or malware distribution campaign, where the initial PDF serves as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3400

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://hb1004.com/userData/board/file/13071874808.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c10eb5b11118b465f1588d6ed583fcee/43140264397.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rg2fj8lkd7fj3oe01td6645t7e/74776968494.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/63725742443.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/dixevozifirek.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/93431396296.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac5d9a31d5---webidonenusarijijefigo.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/jabexuv.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf73b57fa4d---dados.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94cbff33ec---44173789230.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/kiluvasemixigumogov.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021061806450673499.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160773fa0e142d---labalarejuxidur.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab48c35d5bf---pagakisakogelivubepubawi.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/8759e2b29f9d63107d51c929c780cb74/nenilemowodiva.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba6da0b40---mopewewamamoboder.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/66354855636.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071d1783b1f1---peminep.pdfIn PDF document text
    • https://xistenze.com/files/files/devomepawaged.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/kokamupo.pdfIn PDF document text
    • http://vinmexindia.com/uploads/81696628910.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/bebuxawuvubipanuropelotuz.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210524161643.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611f66ce23988---dimuvobudipifin.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160840d4116879---pobifabat.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9951c97eeae35dbe0fd7df4f7e54a13a/rurodapusuburit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=printable+number+line+to+30PDF link annotation
    • 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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 16772 bytes
SHA-256: 135ba136ebeffa904f76a84a527ddc89cd071a0479343ee0f151264c16fc16f8
font_01_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 10636 bytes
SHA-256: c13ad147c538740df9df1d35bbda04025bff7233927a1d1a0743eb041faa6c3b
font_02_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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