Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aa8a5089dab8c4…

MALICIOUS

PDF

73.4 KB Created: 2021-08-29 02:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a82fbb83d8d85219fc755ee264c20fe SHA-1: f3d80b2ad1a5a12d9a70e18ebcebc7d9e7dd21af SHA-256: c7aa8a5089dab8c4891e3963f09e86b12c8cae42baa697daf21c71338cd8fe53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting the primary purpose is to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=how+to+convert+word+document+to+a+pdf+file PDF link annotation
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/rukoxetatofupuwara.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/b00ss6be6livru4rq2l6n9j32t/webisaged.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607398591f8f9---juzokunatoka.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/3gh4vemhd5vgukm52flmeqpk15/jakujavukekupelowebowame.pdfIn PDF document text
    • http://aqcons.vn/upload/files/31430873650.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/59af92507f2a3b0819dfcf63bfc442fe/57578786415.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b389b3158---39174644380.pdfIn PDF document text
    • http://nensi.si/upload/file/toliliduxetem.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/80879480017.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/tijomadov.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/woxera.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/nosazizudixefevejez.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/zomudegolozasiz.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/287e5de153f15f81685d5989d04d7e5d/gusanubiruravofikaki.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160a029bbed493---80072266844.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/kabewezapodiba.pdfIn PDF document text
    • https://clinicscrm.com/img/files/22462199001.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/aa6aadaaeb6317260c747334acc25229/40807312552.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160827f4ac6e98---rukexudigefimuduv.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/58773f578b924bb6c6bad37ff260ef97/watazilawatotuj.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/97642833452.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/b06dbb878aaee5148461d761f95e1157/joguraribodiboge.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/tapavukabogino.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7f160c21b6f1c7d87109aa70a5083f20/8628565478.pdfIn PDF document text
    • 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_off0000bdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 16204 bytes
SHA-256: d15338e497881bcc733c2028843944c3e1bd9b0d2c9ad7ecbbe512929c9a2636
font_02_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 10856 bytes
SHA-256: dd07cee9090561d1aac3799b4c06efb7748c84bb0dc56e06e77b29a016d5ced9