Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3e8d94ab761eb4…

MALICIOUS

PDF

82.6 KB Created: 2021-08-21 03:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5c344cdc879b419305cd9b22fa663976 SHA-1: 3677ace212d4670e8363d204c1334074e9af0da6 SHA-256: 1f3e8d94ab761eb42b53122bd58af950a04a75a68a28486364411b2f5ff1bb35
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains numerous links to external PDFs hosted on compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bataretak.com/img/files/file/baxitisa.pdf In PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/ronimuxokuwoxiritepowivu.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/wedinewituvigupoletak.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f08a53949---juxumumapidifafezujafufep.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/15d5756b8f45f9ca00f05a3d34d4e7ea/nidaf.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d73c6fe0dd4bb0a340b61eaad23c8dd6/belutorajojofojexiwaf.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/lakawexe.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/58802909309.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/j7nmcat6st4pt57915craca5lr/suwipafunadu.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/tozogafamexi.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/2f360bced50dc373bbe76aa253b8c9b3/munadegipinezemawuz.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/960a61c40de8203a9fdbff1c6ef5818e/kulivepezofajolon.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/73702897264.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/laxivajirexomowabaweg.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/27226833029.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/rajudobosixofefazugiwe.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/25277825041.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/rikolawaginetotaxafe.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160de17aeb24db---39906653714.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/a12349e134118124002487449b411fa3/tipubojodup.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/bupupizakeliwurupagudotew.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bce83c12c22---82893892958.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/43338031254.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zilekuwawanevomajib.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5719100ec---doratoxuxefikuzod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=bmw+s1000rr+repair+manual+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_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 10856 bytes
SHA-256: 4e748adf14849ceeefc1a8f5a38d322151b0ae7154d48e904d413f62b3af243b
font_02_sfnt_off00010fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB2 17064 bytes
SHA-256: 85d385c6e5e429c06cf6f5966bd3500fa70efb2affa0494dc26a3548ccd828be