Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aef64f6d66b171f…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 23:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 142eefb78b14f5dba5dd53ac5388c15a SHA-1: 1b3e6a9c3ea28cf45f5a366e410b65802fffa5c1 SHA-256: 6aef64f6d66b171f2c1161bdd1981b763e572b4a30d5008ea9eeca1b5c273248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised WordPress upload directories and other external sites, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd2f69a7e---lepugubur.pdf In PDF document text
    • https://hse.tw/upload/file/29632075660.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/20555092419.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/98915226096.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/4gkqsh8mktnct3m5mh9hof4brq/fipaxiforow.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/41521176995.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a733b465b12---42465192191.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/6af542c0236f87f420c547a1e03aaa8f/59032890406.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1e7vb2hne4q82qpsjee6k3fmc1/retiwikazonuninelad.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4434662e3---2331742685.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/98177545370.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6837335d7095811d18a195ea378789d7/pitozogekotorofeximinido.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a101a090a281ccdac97e8218562e2afd/80113195254.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/wiwipapi.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/9734703117.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609595929e9d6---ginuwizuwefuvune.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4aeb164c96ba206d8f7ef3d30f26fb00/xenewol.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/77007297734.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/xotakomogolo.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/vubos.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/bixamizelumataziwa.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/42415339789.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091396023bf6---8750110150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=metformin+davis+pdfPDF 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_off0000bedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDD 16816 bytes
SHA-256: 4d5797df3682150d7b5be4170f6da0e032d0505e7a6760b5e68b56b3558ca8ac
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 10672 bytes
SHA-256: 6260322d79fd3318790e439bbb4969a0b94e9529b540fb25863de291e2cdc155