Malicious PDF — malware analysis report

Static analysis result for SHA-256 63fbf3c66fce4782…

MALICIOUS

PDF

76.5 KB Created: 2021-08-09 03:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: de04bcb7e4e133e5a5e088a03d5c2f3e SHA-1: d163e1873518eab83afd51d4c0562ac3703d425c SHA-256: 63fbf3c66fce4782171acf2c5c1577b6e1392f01153c2a46937ad251228aa668
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to external websites, some of which are hosted on compromised WordPress upload directories. The primary goal appears to be directing users to potentially malicious content through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://fidelishospice.com/ckfinder/userfiles/files/gumeneguki.pdf In PDF document text
    • https://artcer.ru/files/uploads/files/tegikiduludi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7a381932---15757008040.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070be8a27e2d---vujinurevurefovofinabeme.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/25372674644.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/zebikezafaxawowotuwe.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/45333994645.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/e726ffbda69b0ac31e6213752fbb8a0a/ganemomaworejijaxoxonom.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094da6a1db5d---gamekeribosiwexu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ef2a1c7c4f5c6b8650aafd08a87e7910/nuladobekuzegusevetofive.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/c283801878efc4af511abc0f00db4b60/damobator.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/24967270402.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/wimiwinowopowipotopoxov.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7pen121mrf6an6te5r1lhil6ck/12769935748.pdfIn PDF document text
    • http://iphysiology.ru/upload/37090895008.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b9vcj87rrk9cl9b2l9fv99vuk5/nipivowalexegaguleri.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/98510207039.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/31528419870.pdfIn PDF document text
    • http://roocenter.ru/upload/file/lapawojewozotuwunez.pdfIn PDF document text
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/ch4f73mj3katt0m93eukmcopv4/mufajo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b616700d7---81179885178.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/fcd7b334ae16d21314afe467a2389791/63986287244.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210726_3B46E247816C86E5.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/g0m237e90e7996tajssnoeihp4/79049888846.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5f8f2620d---87651913057.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fundamentals+of+vehicle+dynamics+by+thomas+d.+gillespie+society+of+automotive+engineersPDF 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_off0000c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC756 11532 bytes
SHA-256: 52c2ab950b40d9489dad6ec33b0492ff70d32b15b453ce5a2065f722826deae7
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA24 16068 bytes
SHA-256: 78e47218c66be938589fd389d42e6a3d20f00844428647a63fc8fd81aeaa62b4