Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf734040f2f244da…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 20:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba8a432b7010a7bd737e0ff972fccbc1 SHA-1: 51ed6b5694c9f647f7c4f2999b8098f2f6568845 SHA-256: bf734040f2f244da876ae4fd9db1ece9e0686f22911ccd41c69e02b50d0867f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, indicates potential for malicious actions such as downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/57709640486.pdf In PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/65919395575.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1fedd0d0e---govifide.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/50636462194.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed06a021e8---47761700092.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a486db47d58855db38a5c6c4338c9e74/medudu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1edf8617328d4d433f90f567c493948f/35331382128.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/14419323980.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/sedewipi.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/belawamefone.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e273fbe1a49---fenakexuneduvitezewiliver.pdfIn PDF document text
    • https://designclarf.it/file/libadagojejopemewa.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/40685333255.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/4970155250.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/xagiw.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788c419e97b---mijowituwuvekiz.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacd71b31dd---kezagurutomuzi.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/supafaki.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/22926916450.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/77473379518.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/kevexenesiwi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8ba178dd18ff8dda132646b927a528a6/29429089509.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/67510820513.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf856f144---fefitomijorujowo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/p7959cq4mq2f2197p1bubalpfu/90489023285.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/51125236752.pdfIn PDF document text
    • http://fitviewer.biz/files/file/69844592114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sample+treasure+hunt+clues+with+answersPDF 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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 10780 bytes
SHA-256: 6fd922bcfb1310250418567d680ddc85499355f3a8d62d4aa1e474bb41edc50a
font_01_sfnt_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 16552 bytes
SHA-256: aebe74407d15b83cb20f008f0ff9c35cec35fc62564fb6da0d1c6d8cf4f8ed55