Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a3cce9577dceff…

MALICIOUS

PDF

95.1 KB Created: 2021-09-04 02:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 826d022ae062416d870e100be94e1c29 SHA-1: 2df13cea65a9471550c3656f42e4d65beda2d5f5 SHA-256: 02a3cce9577dceff207dd8dfc02d1d500bc9959e19d7a88b08037ce4a71ccf05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure to entice users to click on these links, which likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=crossfire+manual+patch+2019 PDF link annotation
    • https://habibitours.org/ckfinder/userfiles/files/77391956364.pdfIn PDF document text
    • https://hsse.cl/files/51633050767.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/lelimukonab.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/97546555948.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/26768133095.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/88678110876.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/tejukorowudunejaravuvose.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/66623060797.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/9576137201.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161266e66a92d6---zubadakipazujepireduvo.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///55102610419.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c81541a22---97124887046.pdfIn PDF document text
    • http://jonme.net/ckupload/files/wepifalu.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/78668343367.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/pumojuwux.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160db9c205e281---41400752693.pdfIn PDF document text
    • https://rosycaffe.com/file/deveretufebex.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f9bd41f9eadfad46da9460795b6aa330/bodinixefuxanodomojepusin.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f34183b45b---84436295539.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16126f35b45e43---25985717696.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072002105157.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b37c1178e---98853488864.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb71cf1c40---64810602679.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 24664 bytes
SHA-256: 13e214f88a878c33bd9b9d2c64197fe72bab48e7ce173c628862983e07b8474b
font_01_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D7A 11340 bytes
SHA-256: 8348f2295df5d82176efc5c70bcd4489cb2ee1d2dd17c63661b3476956bffdc3
font_03_sfnt_off00015808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15808 16252 bytes
SHA-256: add6c7b71fcaddc83428463317442ccd394cabd5a997d6866a3f2e60c10d2687

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