Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddb5fb33c4d1a79…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 13:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67f05b3397644583dc2fe85a4823c7e2 SHA-1: 994c8805561e813bd60c82058edae3ae4d7f5500 SHA-256: cddb5fb33c4d1a798fbfca52f61783d41b973eac081af688735c7f31618920af
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or SEO poisoning attack. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baschin-heizung.com/meineBilderAlbertGrundschule/file/15615962755.pdf In PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b5aeedf29---31953448679.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/tomev.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/52042638861.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/2861778031.pdfIn PDF document text
    • https://ijpdua.com/contents/files/2757487631.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/97915836849.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/57809946066.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/mufefejuxavigimorepax.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/78214311985.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/lajipiwaku.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161359eb3e94aa---38519262129.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/gunowujanopumurabiwugufan.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/84734021013.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ea03d553b67e651f22c31c6dc1cacfdc/28200840228.pdfIn PDF document text
    • http://greenld.com/userfiles/mesaxukevixufa.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/42029581093.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/jamid.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/jazemidujakufupifupila.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/67132044420.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/45841800904.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/42197133292.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/18845336415.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/munanunukivakon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=live+net+tv+for+mxq+pro+4k+apkPDF 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_off0000df07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF07 16824 bytes
SHA-256: 0ecbce97d17664a68cae7abf5c182212eff33b778ae83b17ed175fdde7975cc0
font_01_sfnt_off00010a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 10748 bytes
SHA-256: e23789bf7d115ade240f16d02f9c2e388bee4d55568777ec88e142106f779568
font_02_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1