Malicious PDF — malware analysis report

Static analysis result for SHA-256 905ee4e1edfbb898…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 12:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afbc29e896022b9cd1271a1dbf70f44f SHA-1: 2dc707293514a12b5048db43f7e8e007db4d2727 SHA-256: 905ee4e1edfbb898f34a0ed2be64bdfff67ef3a91c10498b523c5ad831e24d12
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a phishing/trojan detection. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The presence of multiple external URIs and the 'link farm' heuristic strongly suggest the intent is to redirect users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=android+alarm+clock+icon PDF link annotation
    • http://musorcentrum.hu/files/article/file/98536643537.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/segula.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/jizemudinafawi.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/100815ac27c4ee845a84684242317d6a/73782243343.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/fosexujereg.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/49158871411.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/1865810335.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ac8be5d0eabe6dc465f88f371a6bc90c/jexikalekaxesip.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/gunatosarudal.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/44129942873.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/74342281355.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/75857162685.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/73532540522.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210916044559.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd2726d726---98945029675.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/80670417474.pdfIn PDF document text
    • https://jotelek.hu/files/file/7433343201.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/28687713633.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/jifoxiti.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/vixawomuxanomilanekox.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/59133033872.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/52914180018.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/widuxafu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///40665122612.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613441f44b003---27177418746.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 10204 bytes
SHA-256: 6f7133c7e2fccecd6f3d2ff5f08892eb847150a81df04f833fbce925a3b2ac75