Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9de5e5d9f9994f0…

MALICIOUS

PDF

88.6 KB Created: 2021-07-05 14:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9853a689d6b972982fb32d824d7c9330 SHA-1: a3c212bbf69877ab02be50e6feb9b61222d2e0ae SHA-256: b9de5e5d9f9994f04b5f2e6540a1a73195f0f39051571d090ef385f1bdef6bce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.asslar.de/downloads/kupimekefodej.pdf In PDF document text
    • https://villatoscana-pi.it/userfiles/file/tulixojurebomalegipani.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e8ca86f27db935796c9d5f4b9558b847/motegaxadusisedilar.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/31459353014.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/30730714102.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/u1rdv44no8bcmq1tack33hps74/xasobik.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/ragolaled.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/72348408573.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29f9ba05b---gujakewozot.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1c6f38a97a76de34011c7095c97d7d8b/xugizix.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a69150b06c---31637664893.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/matazaxuke.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0kdri2sb2u3ph94m6q5geeotu1/11491908172.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/06c2fec56040cae58acf4b862ff1c950/gaxadujapatokoritixipu.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/11324386545.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/laseligube.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/jidoripovipozog.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897264832d3---63074689453.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/39506008900.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099926e660e1---16749476601.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/13610805014.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/pevilepesabipominid.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084eb8db3d43---47985925680.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/gujadem.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/55497625608.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/49123221594.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/felisibefota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cool+typography+designPDF 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_off0000f851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 10816 bytes
SHA-256: 979b5df987b0b5b4be69e762cf559a07dc9e5273d2052261ee539ecc2eae7f8d
font_01_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 16856 bytes
SHA-256: 07e1440e60c8bf2581093a33cd79eecfcd917262bef1c8ee6315903dc4e5a69f
font_02_sfnt_off00013d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1