Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f79fa24c0fe738…

MALICIOUS

PDF

74.8 KB Created: 2021-08-17 11:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 19659581cba94a10cb16554659a7ccab SHA-1: 019dfed09f4a487860a44e66f50a662f70593622 SHA-256: c6f79fa24c0fe738ae0fa48699e1c6e7282bcace73086c73eef7ed4d72deb13d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/f2c81b6925df9c8f2f3226e3de3ddf32/fodepewa.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161100cceea486---nisikofopijedoselo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a793224601f---xexuwok.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/27891151952.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/nokopesadasuliz.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/43045206277.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/51954625486.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/puzikejanixa.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b8f47f07---64867871583.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/ae2sov7baun078c9k4vbp5bodo/82043876756.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/amrgelgmkskdmm84bqtlg77e01/75796314019.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/zoput.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/rjqvndh84oq46pvh1k6b4frvt1/2270268166.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7e09de6cbc39ab9a31485bb065077850/34763001063.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/51385106473.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/279b01c5c3a991fe8f38fb9be30b930f/56244256489.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077a8da98435---408920195.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a40171b44a9416e81ca523910493c9b0/1219898806.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/2890740cb6ffa4f9f9e49373ad47b97d/pikuvido.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf9324798---zuzexodofe.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/8748807348.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/57533961809.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/wugisuxulonapedeweleja.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/14282707011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=la+novia+de+estambul+capitulo+251+completo+en+espa%C3%B1ol+youtubePDF 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_off0000bdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 16708 bytes
SHA-256: 7410ee4cac41a2017bd9bf372297b191cbd1baa187d05d18d833c7600e620bda
font_02_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 11464 bytes
SHA-256: d883b44bf5b6b3c4cf69837d7df21943275938acb94d090f34f9ae27b8a65237