Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93b538eba8a33d2…

MALICIOUS

PDF

77.6 KB Created: 2021-07-04 16:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 30c40a75d39f6c26e8c56ff9ac6a86f6 SHA-1: 7ab2946073b6613225bebe804e42b4567b014f6b SHA-256: a93b538eba8a33d2a4abc36f369070eb148d1c1cba2765d185f96015e8f3b18c
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains a link farm pointing to multiple compromised websites, many of which are WordPress installations. These sites host PDF files, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://feuerwehrobrigheim.de/upload/files/9522717685.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/oh6de0r4kt4skjkfeov89l1412/fajutelakokubo.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/31nae3k6cdejdkqmt26j50t98e/56088198575.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/0bade8802a71abd00ef688416fa9a58c/witesobesi.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/iubokql6f50m06ac4cve1jpcfu/89710042112.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/30684023833.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/37957364230.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/80962493473.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/d9f0fc4ddd26ffce1ef36adefbf901d5/80660804880.pdfIn PDF document text
    • http://nineslash.com/user_file/file/xorif.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/bd2f140d7327fcb6274c1840408c1a65/68191134552.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74fa01b44---sinuzefekewiwodisupaforu.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210522010714.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/ruregikefokijox.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/sosixajuboselibirusakem.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160e16c9ad9907---bosina.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/o9g7sk1vsgjnkhqlshgklj3cp1/deburajejekupaxiloseva.pdfIn PDF document text
    • http://hydrogears.com/survey/userfiles/files/45077213035.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/tepogab.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/9005668a9bfadd7e133efc41bb961ea8/tunirizugurak.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/4s0gv2ah4atvhnia23kk6p1og1/98886087074.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/21657203788.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021052914355573499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=when+is+the+eid+2015PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 17916 bytes
SHA-256: 046fd6903694f5f88a6435d1888a05e36e37d4bf0cd7c985f004e1d4e12caca5
font_01_sfnt_off0001143b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143B 17164 bytes
SHA-256: 922e088e9ba6fb2f1233693751303d6aed17bac55c349adda7906295f0b115a6

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