Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dcb8f4e736b72f…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 17:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 452aeae6ab9e4af6f0c44bea6f0fb9be SHA-1: 861c92e672bef7bdc9eafb6d216e4ea374c8fd91 SHA-256: 66dcb8f4e736b72fa8d222d08cd1651e966afa244bdc32467aabacc042ca0452
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16135a61a17591---nopelotijudaze.pdf In PDF document text
    • http://the-bom.kr/upfile/files/xizusidiram.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/65270192194.pdfIn PDF document text
    • http://slr-eyewear.com/slr/userfiles/20210909080642.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/wuparorunaluwexabemefejir.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/58176682678.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/jasikawovifusivenipubirip.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/mudamamudi.pdfIn PDF document text
    • http://rococosofa.com/files/files/garogasuzaxegowexo.pdfIn PDF document text
    • http://sapthagireesyathra.com/userfiles/file/62815424490.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/jilaziz.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/nakeboluwoxo.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210904231324.pdfIn PDF document text
    • https://xn----7sbeo1acdy3adh.xn--p1ai/userfiles/file/bepatolulopupijav.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/5325416476.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/48811240091.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161449e22ca2eb---63370815059.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/xutesoki.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/20337314079.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/godilulupaforif.pdfIn PDF document text
    • http://iccarrentals.com/files/file/rokewilalirozoze.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/kobavuwigiv.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/gavotakovewutunuxo.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/f19e943ff8bf733b01c15b37cda0baa3/kerutamalikurijita.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/vubikebelikatab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=gi+joe+rise+of+cobra+onlinePDF 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_off0000bce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 16532 bytes
SHA-256: cd082f9ac3c4e9716f33d10ef51843c92894ecfcf778750c6fe3ddafd921b53b
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 10540 bytes
SHA-256: cae3514d25fab41362b10f97d1ce7b4fcb422493136e4fa57ea3b6c9590b181c
font_02_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1