Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a6e9900e524587…

MALICIOUS

PDF

84.8 KB Created: 2021-09-06 20:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd9b2d1d76dfcfec6b39eb3b7481a8ef SHA-1: 71295274b560c280bbb0bb2a4d7e1f0854147971 SHA-256: f4a6e9900e524587e78ea5dbee53e86ed0086d1b0399ad7970fdd33c52211a0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://defhjdrjioo.friend-match.com/upload/files/kodizumifu.pdf In PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/tq0ntuc9ad1kol941n203pbsbv/gitukenidegakawumumibubok.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/53013462243.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/40351629104.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5804a25f1932f1c7d226ac99da1f729f/potafisumafatalenigav.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/246369770.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/85484052083.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210718_5B1840FDFB0E58AA.pdfIn PDF document text
    • http://teplospectr.ru/images/files/sibevuwumumamurowew.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b9a0baa2---60188596825.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/bepiturotogumupidom.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/benaxefojizisozebe.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/bonoxulavowefuluduzis.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/33189317891.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939f457a98c---80272261143.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/tn8hsc038hve4rd3n1e0e31t2s/vezaludumurumavepoko.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/19c4bf3b291cb49932b07e68da98b5d5/74731568231.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/kotejipimaruxidax.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/75233951781.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070feb7b5387---29723655385.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/pamagelexew.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3de589254c5064a04f74c3d3ad31cbb0/beraxafefukax.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/86467757121.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/24728752665.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/42147527963.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=se%C3%B1ales+de+transito+pdf+argentinaPDF 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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 10952 bytes
SHA-256: 613f27822f02d5ba36412d6fab9e11a3db6412c1dd01cb83d25452012b4e921e
font_01_sfnt_off0000fcc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 18240 bytes
SHA-256: 28010ad0af2cf6ca6aff40f3389df84012553981b6cf6df2a4c1be3b306d34b9

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