Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a57372bf8de8a04…

MALICIOUS

PDF

77.9 KB Created: 2021-09-02 06:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f3efcaf254ee509402002a1e6794a0c2 SHA-1: 060d0f97274ef70c53c980d734c1a1682840f991 SHA-256: 6a57372bf8de8a0444c38908a5366c4d642fc1965f0fdaaca033972e0ecaafb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple compromised WordPress sites suggests an attempt to redirect users to malicious or phishing content. The primary attack vector appears to be a spearphishing attachment, leveraging the embedded JavaScript to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=particulate+ionizing+radiation PDF link annotation
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a31eb07775---25633415414.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/nikexijemegonigogeke.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/cf086002797da3c3f164a2b816a46186/weginu.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/galowinuja.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/29e6f5772996488dcb34337334981961/felaju.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080de2b9c28b---51353448610.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210610_8F6F25B8A44BDA0A.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8a32b7cd---69993956245.pdfIn PDF document text
    • http://signauction.net/userfiles/file/5135336695.pdfIn PDF document text
    • http://abnicum.com/files/file/21944707203.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/40871717808.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/nesogujidizagopap.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/nozaxekoweramen.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/r7jj7edt236hdvqkvgmbhp9bs0/75763349939.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/munepemebapugubeviwebox.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/53871879495.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/08/file/nefekuludofejezewoxi.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/10435320425.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/ridigawuwe.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ar9tbtge5fbf5t8ealapikg2c5/xesuzavujem.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d8e4c47b6ee025158023b38f4dbedda5/8879527781.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/62791164757.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ef78205b3b3d0cd83886abad4c009e07/razuridezibilawuzibo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb373852a---xipexidomibekofinatuma.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/78f03eebd5a424e7fa371749277831fa/6050593439.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1371b8208519f56696e9f1f6c5e96f3b/41564830389.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/vijajobuzujoj.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_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 10540 bytes
SHA-256: dddf2281d5737eeab077c226779267f6c6c87a355d33d6b5f65f5d8c895254e1
font_02_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 17480 bytes
SHA-256: 3aa4aba0cdeea2deef5f783d90350823771b82aaea11f720a0e22334b151ed60

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