Malicious PDF — malware analysis report

Static analysis result for SHA-256 144c978c557d32fd…

MALICIOUS

PDF

93.8 KB Created: 2021-07-18 12:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 523790c1a601bb9def1d116045ebffc9 SHA-1: a76051c028ec99b8913daf65ded7894b6278f74f SHA-256: 144c978c557d32fd75b54fd5b8789b27bb03ef8df068e4e7d1a2aa60b465c61b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://gourmethousemacau.com/UploadFilesfile///jomonisuxojolinenutapibu.pdf In PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/28f468afc008b506c58c3c77713ca099/zesiwi.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/pemodifasivaro.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/94200970355.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/93142967107.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609af572336e7---23288822403.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/nobaluk.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074286c40ace---nanadojoxugorurozo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b32cba3ed99---40661343876.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/98062614210.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/69367129998.pdfIn PDF document text
    • http://rc-modeller.se/images/file///59826649150.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/788e042abf4e6deb41e417a7e14a3707/lexefip.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b4e09c692---wagaxamemewiwifavi.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/8hvg2cfsn8ia4gnbmevuhd53b5/nagadowo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f435083504---69810304371.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/gopigavarufobusonek.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e283e81106---davugexusujukurolesuko.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/jujoziwawukorena.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210527211046.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/pifosivelifogeved.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/dodipalutado.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/wesixilepofivatate.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/wogozegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gradient+of+a+vector+examplePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10720 18956 bytes
SHA-256: d5733e065176b65bbfbd1173e4d7a8ab9978fb17625c5693d458e6da4cc967fb
font_02_sfnt_off00013a18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A18 16424 bytes
SHA-256: 831e63f55fecb0b3d1e0019ec2c109827478611dfb210189d50957eece711945
font_03_sfnt_off000150ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150AD 10820 bytes
SHA-256: 0d4a9249fc351915709468b9b66cacc63612a4888d849953a7a8d866fab2c67c

Open this report in the interactive analyzer, or submit your own file for analysis.