Malicious PDF — malware analysis report

Static analysis result for SHA-256 53821f6f9316fec6…

MALICIOUS

PDF

117.2 KB Created: 2021-08-07 21:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 759c32ea56f73baa74d47b9e4151f794 SHA-1: 71f1a7bff518c7d05770a79d96cdde6f6417a897 SHA-256: 53821f6f9316fec6e2862d45e1c4b8eb70e2f412c13acb3cf2e782bba7f012f0
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.1745

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://brs.jo/userfiles/files/liwejokupomosepi.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc37721352a---lasawomakivexumu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/k1bqo3n09oj2phl27kadfndap2/84142423394.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608670494c6ea---1631600376.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/20926821158.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fe2cbe35d---92492385485.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/tumukigoromu.pdfIn PDF document text
    • https://best-label.com/upload/files/vebolumuwexa.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/fagofud.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/73639148489.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/xekokanalerenekaxizimewun.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/91479080532.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b32544bf---wugakoxapejexelanu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91fac7d3d5---12590454913.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/73f4c16155867b42d2dcbbac83f76652/14304262649.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3ece85974---navazigefawimefo.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/33970250248.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66733f907---rijusuvitugufaveje.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/e0bad1506fd9afee978e8ccfd543c8f5/79309919150.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/12pjfnpd7q3ko8bvf1eeala3s0/31069193919.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607284d1e6074---94907852624.pdfPDF link annotation
    • http://epoxidice.ro/mm/file/3097132019.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cf59e9ef---90401878722.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/dewadibumebarapugapob.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde0d507eb---jalaripu.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/bojidik.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86e528eae1---85336129622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=matematicas+tercer+grado+secundaria+respuestasPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000198a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198A0 10904 bytes
SHA-256: 2e273279c53c77acd3761db874eeae01011df142e2c47e3f9927485d83eace2c
font_01_sfnt_off0001b1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1