Malicious PDF — malware analysis report

Static analysis result for SHA-256 0791b97580bb3496…

MALICIOUS

PDF

79.1 KB Created: 2021-09-08 10:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76dbc54ec97549322aaa79b0e6468390 SHA-1: ff0373e22ffee6cd389889d573b4c1532d82241f SHA-256: 0791b97580bb349684160ab575a5f486c40450890ad18adefaaa1e46a3d31ff6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the PDF as a link farm pointing to compromised WordPress upload storage, with multiple distinct hosts involved. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610057e351a8d---23895256769.pdf In PDF document text
    • https://0900107678.com/upload/file/2194436171.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/14552e16d5f5073bafefe48fc6883a67/75593021698.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/xovumowawiwexira.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kalepagedifor.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/malox.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rj80ukvfgv8ruh7pgjtuhlfof4/bipokedakirivofinu.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/38737832075.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/linibumejodu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf89feba006---voganaxopalufidisaxasuf.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c1fe2361dd01a4d0ca3697367472c71a/xojuzurupipifasifalaxomo.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/60283344666.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/36845737982.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c0e32daff---zavuvofusulanuvi.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/cab14938056cdbb476c34dbe385691da/gotujufisupuzaponese.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/vowogikir.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada88b5538c---77212049440.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/21611522092.pdfIn PDF document text
    • http://labonscafe.com/userfiles/14025274467.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161156560b8573---gamuxiso.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/pumusekanexufid.pdfIn PDF document text
    • http://ippon.lv/uploads/File/teguposiforawagi.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/gibunamonik.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/rokijisomanobanasixatuzus.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210823_145913.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4b07a9bf---kotiwiborisogiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dedalo+e+icaro+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_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 10244 bytes
SHA-256: 727d5fba58c5690d8f63727fba65b3c136c85d61d3dbf19d4c72971d4340585f
font_01_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 18592 bytes
SHA-256: 68e501a8cc4b57c7512898933772e890b541d6c3d344e1a9bdd5d4d2bfd773c9
font_02_sfnt_off000116dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1