Malicious PDF — malware analysis report

Static analysis result for SHA-256 b646bb8c35a513ba…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 11:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59c39136ba7b3d33dd9928051962c491 SHA-1: 1692daf50678d07c4af49b1a321588f3d928ba14 SHA-256: b646bb8c35a513bab14c12ec8260c25177375d7b8112cba9795d9b9e695fd027
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on disposable domains or compromised CMS upload storage, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://nomylo.ru/uplcv?utm_term=thoptv+mod+apk+2020 PDF link annotation
    • https://luminex.pl/upload/file/befokafovo.pdfIn PDF document text
    • http://domario.ru/userfiles/file/55117665782.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/41767825174.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/61292594246.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/zovoganejebawidixemopo.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/tenigakuxawosim.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/bafejunakivaf.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/94246173174.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dajaju.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/soluras.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/23824436090.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80493059468.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/53595430422.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/34390527586.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/suvugo.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///tobolapakibivoxopalusebot.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139f9cc8ab64---61338966173.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210913202833.pdfIn PDF document text
    • https://www.vconsole.com/ckfinder/files/42766647112.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613635cc29186---kukik.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/jipumebibuvibotaxikadiga.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/89403860623.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/37372339885.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/13156862243.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lc9pbgesdu5deebotuffnkamrm/73376050935.pdfIn PDF document text
    • 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_off0000d099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B0 10380 bytes
SHA-256: 633b1f2b39757cce69ffd00c4164a76493d82bd5277ffc8bc8f4ae0f22f86c82
font_02_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 17200 bytes
SHA-256: 08827ae9a538b875acf178fab876c843bf2938db8dc70650c22f2602c44e1e9e