Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2653e5e1cc4dd1…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 17:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1899d9741c422b0bff9c55fdb07c537b SHA-1: f6500dcd1a2e258e513932ccf7bbc2fdfa8f2021 SHA-256: 2c2653e5e1cc4dd1a4e79367d65dfaf26644e6366ca488b4fddcab539de248cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of 'utm_term=download' in one URL suggests a lure for downloading content. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://professional-tuner.at/uploaded/file/jewalemafimabexagusim.pdf In PDF document text
    • http://kco.su/userfiles/file/45239789949.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/90911932176.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/ramibawisunawevatowofigut.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/sifamojetomeb.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613587b1e95ed---manivi.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/dadosilozi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2a2eae0c06882b7fc1e359341446d17b/xagetow.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/pokob.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161410ec7073ff---sivunazelavotixefupuk.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/nutotimobizeruvewebitop.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/43676334319.pdfIn PDF document text
    • http://laserinnsbruck.com/static/zedoxepidiwilixapafex.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/38021166703.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/78218816659.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/mizituriponupivek.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/sabirosugejurapiwomexij.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/sogowuriminovikimosuw.pdfIn PDF document text
    • http://plise.org/userfiles/file/mobowipidakotuwiguj.pdfIn PDF document text
    • https://pecintajp.com/contents/files/98875201553.pdfIn PDF document text
    • https://zagi.hr/files/16280628525.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/zizosabanokajopumado.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376a170cdbd---96642529746.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/kogunazare.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614335bfe01ea---49689347567.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/xidikotibepapolipotor.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/gawelanexula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+my+showPDF 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_off0000d3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B5 10292 bytes
SHA-256: 080d9301da46c19f4311556f2fdaf89e2272cd31cc379d574993d40b71fb4d09
font_01_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 17208 bytes
SHA-256: 28f6d5283dd2a61bbb0d6ebaf744ee1c600647f5c351e806d5003dbd189b2c9e
font_02_sfnt_off000117d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1