Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc614c6df851578…

MALICIOUS

PDF

87.4 KB Created: 2021-07-14 06:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ee7fed5d8ef6a99364518dbdfa80a68 SHA-1: d72cc508af24878f33ca3f2003f0a19d157d47a9 SHA-256: 6bc614c6df8515782762c8dfdf105b7afbfd1749fc80a7aa08cff6c999c47bef
156 Risk Score

Malware Insights

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

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 compromised or disposable hosting sites. The embedded URLs, such as http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609030e25fbb2---nabalarujenowabip.pdf, are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://emmaushuis.org/pages/52982483385.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cca2ab0273d---xajevazotewuvokiguf.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/22929584909.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/totimuradipetakexatasode.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/417282109.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/04ce246bf739868ed9ce4f2bae1352f3/virufodovofirur.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63840715062.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609030e25fbb2---nabalarujenowabip.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/4863906774.pdfIn PDF document text
    • http://15889163.com/ckupload/files/bomegijosaxazudizu.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/95242424302.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/2454e013679c756452627b21e8d08556/davixe.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/najifetot.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607b855751cbb---83617085555.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/rowosubaki.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98bd2a18f---jopisabanewera.pdfIn PDF document text
    • http://cwesp.biz/upload/file/72848286257.pdfIn PDF document text
    • http://askort.pl/Upload/file/31723605443.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/tnpksrh9r6ul5g35e9q0mdv894/lakatax.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c67e1cc96e---raxisuborabulonixukij.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/95563359474.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e99998ad---53780527570.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/38176735860.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/femerijubomifop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=evolution+crossword+puzzle+answersPDF 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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 17204 bytes
SHA-256: 6477ca94c7f666caa447d6839ee5b5ab14760417f40703deaeee593e6ecba8e4
font_01_sfnt_off00011f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001372d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372D 10800 bytes
SHA-256: e1af843c139dd1a6a20f9709685c610dd3f48a1c851c57aade88da80e5063a1e