Malicious PDF — malware analysis report

Static analysis result for SHA-256 9630fc1e0c886e68…

MALICIOUS

PDF

74.6 KB Created: 2021-09-22 16:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7171e74f7b26f334c91e054d579d6dd4 SHA-1: c29225e13abced987bb829f15945168aebe7f75c SHA-256: 9630fc1e0c886e68958fde46fce3c1b0c1d26a6e1b3e9d913226bdd1b7cd3dbd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=black+market+apk+ios PDF link annotation
    • https://marljivo.hr/userfiles/file/fefiruxobadavugunalunet.pdfIn PDF document text
    • https://izometal.net/mm/file/78791280694.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137877abef7e---14181654537.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/xamimavuvebo.pdfIn PDF document text
    • https://phukienbep.net/media/files/12288527812.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/gisukuz.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/xubemaxe.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/77421955473.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/8265965823.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9f980c35b---pibanepinobositikowekone.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/28460527036.pdfIn PDF document text
    • https://123natura.com/stockages/files/molumamozisesisimeke.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22000515422.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/rowojufexus.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b048f01f4e---sovomimoposomexefakodera.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/95746653128.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/69244247017.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/votiniliforibupime.pdfIn PDF document text
    • https://stopserv.ru/files/file/93110876360.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614125c0aa4cb---32802886754.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161461ae9ba14c---45964486286.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/karubademanimalepulupuxan.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/logovulip.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/zepenezixijusoneloperewef.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_off0000b8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A5 10576 bytes
SHA-256: 7dd0f7e42caf23031351fd01da84a1b2d55fbaf264459c99f6c2f8305a5a4da6
font_01_sfnt_off0000d0d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D5 19632 bytes
SHA-256: 53bb932c5e36be5810245d1b06d6042fccbd975d7673adbdb10a83b715319574
font_02_sfnt_off0001045e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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