Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7775c9d8d8ca557…

MALICIOUS

PDF

85.1 KB Created: 2021-09-18 03:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6afe189f22c65bc478c5981257d423a SHA-1: 80b45c01a6d5b55e614de868fae27590d9969fb4 SHA-256: e7775c9d8d8ca557f71206c9186322b0dd0ac514b6f23f213ca4e603c2c2dbb0
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 to external websites, many of which appear to be hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=android+antutu+benchmark PDF link annotation
    • https://sikahaiphong.com/images/news/files/51288378091.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f81add92---pujotobexalezedowabosup.pdfIn PDF document text
    • http://www.og2c.com/images/file/81164370200.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210903_66EC0833034402DA.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/noxaxuf.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/88415100466.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/70886204399.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/81427329395.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/12256437264.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/29746524847.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/59150575016.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/69589534253.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210917061236.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394b744f948---65386211724.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139e7f153d79---74027090866.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/99940988028.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piralixomakot.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lm1b4990p71ukmaf4neotkc9k6/narelip.pdfIn PDF document text
    • http://innersolutions-uk.com/file/96009486829.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/mevotalubudib.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/nisigovisusipevebomijaf.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd019def0b---kagimiwifiwogurarasi.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/80506722552.pdfIn PDF document text
    • 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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 19192 bytes
SHA-256: 033c76996b51c3db59dec170c753ead329c9a55ccec0645d5ce82d57b2145259
font_01_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 10732 bytes
SHA-256: fa8dfe5448c29b8fc0c1a2856f4c43f668070dc29a828e71fd00e596ecf69ef6
font_02_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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