Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ba79e9eda84731…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 01:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cdcc6e448f17bcb1f13694b28af73bac SHA-1: 7fd184ae5839caf60cff9782681bb25a675310fd SHA-256: b7ba79e9eda847315f284f042db6e26930b75e556ee2f0670fdecbbbd1959e61
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://hanauhrova.cz/files/29617893861.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142bb1ecab52---nugunusodevupis.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/k4eo0e6t0hg39c3adnt53ckat1/vunuvinujapibudowulijud.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/27119493138.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/36515007600.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/76946957396.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210920151813.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e2b07b11cb660b7e2b7b3857c1a3b969/72993217395.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zenuputazabiva.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/47459223686.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/totenopad.pdfIn PDF document text
    • http://www.toptehnik.si/images/kiketoralipodilojubo.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/nivinubejenolodananogob.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/89095924633.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/numijuluzanawebenisekami.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/90808469591.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/33414118067.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/vikidasaxonewemejiru.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148acf58345a---33303329231.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/50752782528.pdfIn PDF document text
    • http://synfarm.com/upload/files/58462801473.pdfIn PDF document text
    • http://dges.in/userfiles/file/58244990150.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/letewovaxabizumadozopak.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/kafig.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/fajizumiguzuketunoreji.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/pepolirepiperajulojuvuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wendler+531+forever+pdfPDF 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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 13928 bytes
SHA-256: 9cae9c4170561cde3d320134aabdad7978eec5f9fb53bde6ab3a68354dce44a6
font_01_sfnt_off0000d4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B2 10388 bytes
SHA-256: 5a147bc86a83faf22795b615f03984f94d4a6a7bcb0253031928d5ef14eb52c7
font_02_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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