Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8eaabb391132cfe…

MALICIOUS

PDF

89.8 KB Created: 2021-06-30 07:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 71a45accddc51ced618d8ebe43f98d72 SHA-1: 2e679e38cf79208fee989132a8ffeb59f5baafff SHA-256: f8eaabb391132cfe2a2b603ad4feddb370df826d6676e4c5081a199cdad00849
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous unknown URLs and a specific compromised upload link suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://martom24.pl/martom/userfiles/file/45485714153.pdf In PDF document text
    • http://yuha.be/_files/file/70463098313.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/71818622753.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/pezosabuvavapebi.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd48dcde30---fonoge.pdfIn PDF document text
    • https://anfauglir.com/images/file/45671886222.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/59325441957.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a24ec61b6---vodatewebi.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/87505493042.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/megadagodejotafibikuzek.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff4c7b4dce---luzesilezelimofob.pdfIn PDF document text
    • http://17njl.com/userfiles/files/84604093739.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/jukisunuvibisixafutuxif.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b355d6f7d---tuwusoketuxuvuruxixomixa.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/12922494825.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/vexigupi.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25d3b6b27ba080cdeb8f7d38ed1ce17e/49124003222.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/momaxopepopoda.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/74037358253.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608438e38b5f5---kumopukinej.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/86604253861.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/fa84d159216efa0037c87bad0cb4f539/tuxumed.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/85861391982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=coin+master+spin+free+2020PDF 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_off0000fc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16748 bytes
SHA-256: 161e496f2540800475d4b6167dbd3c9ac8fe6259465fc45fff3a63bdc7565c3c
font_01_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 10748 bytes
SHA-256: 920251e8d5b3dc62a5c87b026e873ac010f3953a3260693a8792ef3883b42d5d
font_02_sfnt_off0001406a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1406A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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