Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed98923c416ac1a7…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 08:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 287af2f69881867c0e4958921b9d10e6 SHA-1: 2ba780f7d94c4a51bd695aefaa19884e80fa2a53 SHA-256: ed98923c416ac1a79c9c542fa84e0c50e99f71462cdc76851eedc6c937431633
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. Analysis reveals it functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads or disposable domains. This pattern suggests an attempt to lure users to malicious destinations, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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
  • 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://horkolas-gatlas.hu/ufiles/file/69485482490.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nuboz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dca92af7a7---89395702557.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/guvanumasoletasodivo.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/durikajomunafedozagadamo.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/19592640555.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/resupol.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/xuzoloradusojapilemugup.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/diwim.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/62213676684.pdfIn PDF document text
    • http://epplast.com/files/file/82880729134.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/11762035783.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161421e3d26895---66056379766.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/22969026262.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/87787977160.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/48597456546.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/27748755050.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fenazufebogu.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/56545144532.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210914143521.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/zapefopuwexasi.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/gobujesaburapojur.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/92371558660.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/ravawafizu.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/lototukojavoloboja.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/vudurawavabogelafonim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=magisk+compatible+devicesPDF 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_off0000b40f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 15496 bytes
SHA-256: 6e81923dd198027b522059352d0dc394307d5abd81e5d173e188de8c059b0bf8
font_02_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 10944 bytes
SHA-256: 4187619b1aed42cd546b4da6c64c95325dab83648b5155feb597f42401889746