Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efab454ff6f7469…

MALICIOUS

PDF

92.5 KB Created: 2021-08-31 09:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: df02c57bfda8916720adc62d2dda7118 SHA-1: 2edc06038d07ab006edb39cd48678b6d42ee6747 SHA-256: 4efab454ff6f7469ebdab98860bbcaa6f293e8744c575391a02b2f57c24d5e0e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://fc-junajted.com/upload/datoteke/sugotavusaxivulujog.pdf In PDF document text
    • https://clickbox.ro/images/file/77479649670.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1612951de27b6c---29295095978.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f582d333b---fufesowafito.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16083fea842349---zinuwut.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d10bfcb2---45057741335.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc05d2a57b---pejebiseveraginonu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/qt3ld84tlhglo1qtv7okmtqdd2/kodavutijorafir.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202108261343072545.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/16489548809.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b80e1b3415c351ecfedf4ddec52618e2/denijexit.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508180652752364.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/7717933043.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/7227899d2fcb8831c8cbe0a265ed3026/99681424076.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160769e6f61638---16796903651.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/wifalamofaxuru.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/13063534044.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/18680392995.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/fakisidekexaxigaf.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/48037586898.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080420364129.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d4cad64d75a15efd4845674756516755/zopagin.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/sosajogapisonated.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/212e17f6af71c94acf7b729edf163ab8/ronoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=vision+and+mission+pdfPDF 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_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 17512 bytes
SHA-256: 2d3ffb1931d97e57d32fd1091dc37f69e99ae22087358db5c90bd06d6756b44b
font_01_sfnt_off00013453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13453 10252 bytes
SHA-256: 3682501f4bc4afc0df174545b1a45b43896699f313e5f864f3fce102e44e9f40
font_02_sfnt_off00014b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1