Malicious PDF — malware analysis report

Static analysis result for SHA-256 da913554672faa79…

MALICIOUS

PDF

71.8 KB Created: 2021-09-12 14:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2450528f41f33b3b16b91ca3c7679a45 SHA-1: 2b8ba67a144462e5a80e63c071972b2e3a643155 SHA-256: da913554672faa792dcc126e0b593f8c2e9b9c95cf3098bf94438fe2977ec4e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious sites, potentially for credential harvesting or exploit delivery.

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://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f33346fa3d---61381842861.pdf In PDF document text
    • http://meyanko.com/userfiles/file///putaxupuduzexo.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/47888548042.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/zezivojarinepane.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/setalikutanoletumejupo.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/jupakujimukejone.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/10234974580.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/tepupim.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc8999e7d---wuzibomurawarawak.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b13a5234d---92886403058.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9d6c47c0---watowijesewufimagonow.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tibimazomalinawazidilum.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/vipati.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/49919983120.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/e4f0c7fa7608dab1fe848be3712c5ecc/92878309843.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/16511898720.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/kafoguzitumunuvilox.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/galavajivelisujesefosaz.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109080015091358.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/runilesupifage.pdfIn PDF document text
    • http://esistore.com/userfiles/file/64318084713.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/1347000584.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-3/20210903184721781464.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/43078419847.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/77268047600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=free+fire+mod+apk+booyah+dayPDF 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_off0000b8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D4 15924 bytes
SHA-256: 9ccd306c80749b418ef9d40327d10a1feebd92bcd1021b4efeb6cae85b1938aa
font_01_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97C 10672 bytes
SHA-256: 378543a4fa3585bd8ad8a0cac125033e792cb4e909e4ad6eee073b9b933fbaab