Malicious PDF — malware analysis report

Static analysis result for SHA-256 df788442f6bebd58…

MALICIOUS

PDF

100.5 KB Created: 2021-07-23 07:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 637c03810deb8667ba4dcd1bada617d7 SHA-1: f789daf25d243694485b0238693b170ea71503c4 SHA-256: df788442f6bebd58e273f86c1dfb078772b5726baddade8cc88ab18d58e8d903
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, many of which are configured to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to these compromised sites, likely to deliver further malicious payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a112dd39d57174849fdbc168ef53df17/64401781056.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b241e0e606f---mizowiludit.pdfIn PDF document text
    • https://stopserv.ru/files/file/70977799418.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeb897c0ce---20669023118.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c91084d737e---97335116927.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/84391672030.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/2fe1b2cf58f52d0e35337f14fb38501f/bubogulozerusudesenuviwom.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/e542393006c2ed35f8923cad9b85f095/68952933846.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/78470465234.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789ead31f1b---31283997721.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b31a0615cc---kepobexiwexu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210519162631918.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8f411826144aa6a3430b15c936b6b5d5/90598590976.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/7670cdbb43e5bedef19e922b296e6db2/gibupupodono.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76c03d31a---xekiferufofotomex.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/kqtfmc6v5vab0cehhj57q8qpnf/majibuxuso.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/54157054405.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/sobawako.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe6dfb6d54---jisubajupexu.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dce9b63630c---79987690081.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/basinavakoj.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/45482391136.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/selutitesefinate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=patience+and+long+sufferingPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 22752 bytes
SHA-256: 599ab933788ef60849333d8294e6dffb7a358ec1f2dd071b46b8297fe848eaea
font_01_sfnt_off00013b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15352 10752 bytes
SHA-256: 53f37b330dc59b4bde9998cee9a6ae7203ef95a5df1eafe91db5397c589dfe21
font_03_sfnt_off00016bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF6 16792 bytes
SHA-256: 99afce267518f98cb5bedf880997d1575cf661b61f631933910a1e3164b398fb

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