Malicious PDF — malware analysis report

Static analysis result for SHA-256 790fa8d3b3eef0dd…

MALICIOUS

PDF

92.7 KB Created: 2021-07-06 00:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c6d9cf59b4f1de838e9535a47b13da6 SHA-1: 42e4627c77c35d4f0ca8b98133fb8ac304a28352 SHA-256: 790fa8d3b3eef0ddfcc6a5866961e73d6ed553c1892f410169a0d866d45cb94f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210630062420056084226uai.pdf In PDF document text
    • http://shahnawazonline.com/uploads/files/87355371071.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e937be61ad4f0c83efc076ef2d242356/wasexovegijupapumozusug.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/13547324687.pdfIn PDF document text
    • http://araonline.hu/uploads/file/jenulukesukonubulij.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3d045fd39---93249483812.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0499a0458c89538f06c58d84e46d3c15/59379988422.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/30217807196.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef66740646---98781933150.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/be23bbf1ababa6e400f9c3d1024492c7/mekajeborudonusiwumevexa.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce851bbf3---87111977682.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/76871362094.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/81233261231.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/93103102430.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/kapefikipozo.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/5bd1345e931e9293bdcbb5204ff68dd8/37612105948.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a88ed5bb---kixodatinimofixumupomuza.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/39771025287.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/dvpqj70ogoa4k0jmqt66actpqj/66465354451.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac117c44eb7---bawuzomivamuji.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/mamexuponarusekeka.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/14542186823.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/52445157964.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87085a44b---tafan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=scan+into+one+documentPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 17244 bytes
SHA-256: 4740f7c2c2276cfa2204293cecd672d84865a55b63c3559dd53ad1e5edd3e7f2
font_01_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
font_02_sfnt_off00013570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13570 10392 bytes
SHA-256: eb41a461fd71e3242968e3c358872a07092f364f91a0a6e92140962e37c6b069
font_03_sfnt_off00014cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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