Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22e1fab67170712…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 20:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5da2e815401153ef32c6a8a65145b3ca SHA-1: c729624b4a46346fa369c7728218782509b29c25 SHA-256: f22e1fab671707125c865652c247f481818edfe544850aa74eb97d657b1ed1bf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://agriturismolionsfarm.it/userfiles/files/wubebexisaxujebelogomawe.pdf In PDF document text
    • http://wksx.top/images/userfiles/file/varatatexabef.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/267f32a90888dfcd6540a3c923407bdf/54131479256.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/tojilivelu.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/6605354063.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/82542209237.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/96220711984.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/80795653932.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/98726366972.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/78114067868.pdfIn PDF document text
    • https://swiz.eu/files/editor/mokufimikovuneputufemolu.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/24090628194.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161381a454bde0---56358807268.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109071324431911.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/50582672730.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/18733688586.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/jakivimodatanatipidikudum.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/xitedeba.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/86011705003.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202193125254281.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/4117738657.pdfIn PDF document text
    • http://rts-3.ru/upload/files/jugale.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613439a91bdbd---55838880353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+clear+cache+on+chrome+iphonePDF 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_off0000d867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD867 16984 bytes
SHA-256: 520bebd3b87fd6d51a60cd0ac7bc3defc65830f78abe8ae8d846632da9cc3b0a
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 10548 bytes
SHA-256: 95d3ce3f24468b6fc21c15766d987bc6f082284bfaa4ab3c03b1b46bdf52c4b9
font_02_sfnt_off00011c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1