Malicious PDF — malware analysis report

Static analysis result for SHA-256 c644192797a6e27a…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 10:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ba187a9286e7e3865031e1309f0cf45 SHA-1: 03f5f7c9e548ea503880868d75cbf2062b3a7d42 SHA-256: c644192797a6e27abad5f2d3a3e2c5424be97295ff4f31bb8cb1cb401ce7319a
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://value.ae/userfiles/file/54870721017.pdf In PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372ca3de155---texefozix.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/kudowujurinozujozi.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16132b73438c24---popodasof.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc30c092d---45598600543.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/xukotesubisop.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/vaxowabomapipubinomefaga.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/digodebivugujomufetogotop.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/nunofilulesinajes.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/punapuxanofimigelukemum.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/46332017409.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910042506.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/paxex.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/wuremidutet.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/mewumepubu.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pokopenoxasemaregono.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/penituzidimudulofeb.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/tesomojidijora.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/debakalusadekefubuxowap.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/luwibugesimazivudisigar.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca7f5630b---31679204325.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xiwisuxesiki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=vidmate+new+2021+downloadPDF 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_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 17680 bytes
SHA-256: ee1e644bc54013d18457b4eccd607f6e68a04798023c0903dcd8eaf96e32adc0
font_01_sfnt_off00010473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10473 10492 bytes
SHA-256: 7392cabaf9388c395966ef3eb947e85950a777f4d39f944f56fe7013c20ec8fc
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.