Malicious PDF — malware analysis report

Static analysis result for SHA-256 5790d43d291916c7…

MALICIOUS

PDF

90.4 KB Created: 2021-07-29 17:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d4913b88bcc1fa87ea44859a56e3c9c5 SHA-1: cd8dd520063e729557e424495f8d35b12838419a SHA-256: 5790d43d291916c7f7b929798331efffc7adecc2e1ea947e2af6866f86bb9acf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://choinka4x4.org/cms/files/file/giwut.pdf In PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c12b58022fc36b033ec4e09eaa60a355/wonusejitixu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/9656297995.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/juvotorepirubugukifumo.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/vemadisupaxenatesutaluj.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/91800fb8533820565a5077a15b680040/dadevazoxuxuj.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8743b73c---lazigodebopolisuwim.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/topelovezafu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a683b8130c4---42857200098.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b455bdc97a2---valonoxig.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/28967985721.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607189545f754---19516541884.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/015f85f44696f58ed501d31b8041ebb4/66791609461.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e4acc4a6---benadufewitevixonudifefu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/niwabuwazivezegoxuboxe.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae019d7321---vewiriwilesujemutodaletob.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/013b361454a8bd614153652a056b82ef/rusolotimafazosewexurew.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5170fb629d---jarogedufonaxevadowotoba.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ad9368b12318babb3de533f0f8d080ad/jefejavuwepud.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b7a593f4---setopaziga.pdfIn PDF document text
    • http://vhs1970.com/clients/873287/File/17256077279.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/46967485025.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608602d76b601---48114983450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=injustice+gods+among+us+apk%2Bdata+%28mod+unlimited+money%29+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 11384 bytes
SHA-256: 08822f79da0a0641d8533a8ba96488d14afd40ea6b7f0d53d8337da2543c762e
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 17148 bytes
SHA-256: 2ea72169f7785aea61b39bbd5e66fc133e45dfd86b63fe588848940d0a460a66
font_02_sfnt_off0001422c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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