Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01572c35b8869bc…

MALICIOUS

PDF

98.9 KB Created: 2021-09-01 07:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5fa5cd4404ef583a696bab7b26896bf SHA-1: 9493d086d6d8ea4ced55e9b02850532de692ea0a SHA-256: f01572c35b8869bcaeec819a766552d74b60ceba5a6f947208c1137eeadef264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, directing users to numerous external PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The embedded URLs and the overall structure suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://paymentor.nl/uploads//file/nixixarofolixozojubejigo.pdf In PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/tuwaponebinaboval.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16103b0677c437---58500464713.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/kikoxilo.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/0536beeac7f16696e5bd2c5465410cc8/peputetebisila.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/15598186316.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/puvesijorajefa.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca060bd5c41---70739145298.pdfIn PDF document text
    • https://ptogel2.com/contents//files/minojizalitid.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/wonojegusubotunuvupafepiz.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/202161624258.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/tn62vu2vff99jgoe0sspbn7p20/zusovokisepiba.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/seboku.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/88836175363.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a725771449f---86707530713.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610308c8166bc---fowefanelikosan.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/1384911908.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/eeb0051914756877c9d4a0501a496923/40063773273.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0ce86098---60685704809.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/rugezopujutelijur.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/limalulutod.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/zifefuwudazixik.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3478c52b2c---37296755876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sonic+the+hedgehog+full+movie+hd+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_off000111bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 10980 bytes
SHA-256: 13550defb236f327e9c8c63145805df54bb4402cbc943fdcf9c2001898909d12
font_02_sfnt_off000142fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FD 22108 bytes
SHA-256: ada2f6aa58e39dde66191865e44795555b4a93359f23d06455bd36cc7339964a

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