Malicious PDF — malware analysis report

Static analysis result for SHA-256 9193c76b9851c92d…

MALICIOUS

PDF

68.5 KB Created: 2021-06-18 11:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 53d2b262ca3edff3fd6a1a16b4b9d6df SHA-1: 7f24293a7856603de89456f7bee16265fe76a4c2 SHA-256: 9193c76b9851c92d48627871041f62ceaa65924bbc5f52c1814e0bd175f23ec7
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be junk data, further indicating a malicious intent behind the file's creation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9814

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 https://synerhu.ru/uplcv?utm_term=monster+hunter+zinogre+weakness PDF link annotation
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa286747e722cd18389a388537ec6129/kafepavefilanulifosivo.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/8de684abd86236e513c31a626a8a6822/31309549319.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/695d741681096b117b6785425961d8ae/tojexupudufopevurugoxep.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160833695e9d8a---zadexetebulemuluzetu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a25cbebb3---biweguwubobozosotigusi.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/wafosunaxuxujavinowoj.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f21562eb---87922653695.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/jm09j5ucrudb5m0ehdtibbr3d1/89870806126.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e8b494cf---3447596989.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dpju3e9voc998kci1mog0a3b75/25917120307.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/kalizamuwekuno.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb6f62535---25356627873.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc188cebdf---48319837593.pdfIn PDF document text
    • https://castel.ro/userfiles/file/89300933353.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 2984 bytes
SHA-256: 622b466b7c13a7bb696b1bf92837937af37c3c6e583ed1988075f1b162750079
font_01_sfnt_off0000ddc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC6 5128 bytes
SHA-256: 452ed0fd6ff5b39485c2633d63b151d9e0fbbecb296d786124f65c2bf9f0ed2b
font_02_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10268 bytes
SHA-256: 6967312ac8affc6a985f1e45ec00eb1c2c6f749bc0034502e69f4538e0db0fb1

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