Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cdc486d3dbdc3f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-13 19:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03113ac65a8856bf72164af8395132a1 SHA-1: 75c6cbd3e3c8bf254c913ab59bab0bc4af73f482 SHA-256: 31cdc486d3dbdc3f0f6afedfa4a761fe70e02ec3595156ff891f393b3898f258
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=rate+of+change+of+quantities PDF link annotation
    • http://urbanconstructions.org/images/uploadedimages/file/jogonuwurupakerejokol.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/51941898008.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/beripofomiwiradero.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/paredisakamumisavamarex.pdfIn PDF document text
    • http://lagrupacio.cat/file/golexawijo.pdfIn PDF document text
    • http://partnercable.hu/files/jokanozin.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/89411491412.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/9867609667.pdfIn PDF document text
    • http://underbutter.cz/download/foto/93212532000.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/78494590523.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f397f0b588---69439425657.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/tofawiminupotal.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/neretikobazogugowat.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/lurozamuso.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfca89c353---64585446747.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/sazumajuvilusimajuseke.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65010954149.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7ed3022731cdabb86345590b5e3682a5/64624290066.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/28445582347.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb26eb2f49---34245762495.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/baab4976b2b274b6dff2636e0341a0a8/98475636230.pdfIn PDF document text
    • https://msvadba.ru/files/file/pawabo.pdfIn PDF document text
    • https://pepsima.biz/files/file/galerosojulepaxugepejen.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109030628003089.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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 10760 bytes
SHA-256: 78271b639211f3833deb97b81f4e00953e409b571079bd16cdc597a8169959eb
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 19284 bytes
SHA-256: 87e0e54057c115673124deaaf942994aaf9bdb7c4caca21b8bf87e454b803fed
font_02_sfnt_off000132e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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