Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c951a5dfcd3500…

MALICIOUS

PDF

75.9 KB Created: 2021-09-01 06:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 732f213e7ab137207aa6cfdf73d282fa SHA-1: 1b44e489ce82a70b530e269a7541f4c3707b5cad SHA-256: 44c951a5dfcd3500c02cfd3b2482bbd47849d2e10aa5dc301e3d26d799697360
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://promise-land.com/upload/file/79333580996.pdf In PDF document text
    • http://ihdbd.org/upload/files/59825286221.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/sivekodasited.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0cb3e590ece5bc972865fef0017e25d4/94692647247.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210818162929080727.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/14799223188.pdfIn PDF document text
    • http://belst.by/upload/file/64714832374.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/vajafo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8e49i3i48gq0tqqie1mm1hurtk/zabizenubodedax.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/lobizul.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3279942223.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/30088470855.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef0b43dfca---3995304950.pdfIn PDF document text
    • http://medi-sen.com/files/files/fapalisikax.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1b2cb6d9c1c91c1bb3b3b7937ec4086f/13589401362.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/93828571842.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/dedaxiwin.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwavepitogizubobe.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/fopesi.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/54886589466.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/jarilixar.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607e107202853---jimitufewobaba.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67d1e803e---logipemaxop.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/kitomimiwivixi.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/xovigabozos.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1f7f4a961---7666201046.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/njulh4roi63fqg5u2qhtce2i61/79045395237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=upper+middle+class+peoplePDF 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_off0000c5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD8 10480 bytes
SHA-256: a671c7689bcd7d7e5dbd8a2638e74216ff4efb1565e20fa4b6c1e9177f5cb483
font_02_sfnt_off0000f596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF596 16812 bytes
SHA-256: df3e55378c4f2e9fdc5cdf85da34a070cda09fcb433c36e3277952318d715a62