Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c2229138576768…

MALICIOUS

PDF

76.6 KB Created: 2021-09-14 05:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a3ed7175593b12a7682843a5c9c33fc4 SHA-1: f2351d8b7e931deca7222b80625208231a765bff SHA-256: a0c22291385767689ac9233e1c287329099d611743722ea07e11954340667c7a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous links and the high risk score suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://sunnyrosesschool.com/userfiles/file/banasebisorufow.pdf In PDF document text
    • http://chamdure.com/DATA/files/rarelaminuxuxalukejufepi.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xiloj.pdfIn PDF document text
    • http://kustari.net/userfiles/file/90111288062.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/larininigupax.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/gisozibaputimebivagi.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/jajusukivulofopeguxibef.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/5153471027.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/61834364984.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/63901967917.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db306aada3---5517282387.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/jojudegamubajurubajolux.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/63467380056.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/39683043971.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/nubikijonibep.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138f100b0632---93201881327.pdfIn PDF document text
    • http://robedecreateur.com/img/files/darizolupuboxopivuj.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/joravuwapezo.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/matewavuge.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/43839461262.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/rutipikozopipalipaforol.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/regitiveboresej.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/magokagopibaduj.pdfIn PDF document text
    • http://szmchem.com/userfiles/file/76587858127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+do+i+turn+on+usb+tetheringPDF 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_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 10636 bytes
SHA-256: 4ea7c57f82d372b3f168daa51cf27de11502bb054e1e3373c3cbd511299ba7be
font_01_sfnt_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF922 16892 bytes
SHA-256: 1e680ac9c58e1320cbea569d3c7f2e3c667def07eb69914523f972ef38985614