Malicious PDF — malware analysis report

Static analysis result for SHA-256 552fa2dcdcf94155…

MALICIOUS

PDF

91.3 KB Created: 2021-06-29 02:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3bc2560d2b88159990b4b554687ede2e SHA-1: b4bd1a66f0a8e3d98fb026e86b4034d9e3555325 SHA-256: 552fa2dcdcf94155a07af1701df074fa8937b84bf27edded7cc0dbdaea35c866
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, facilitating redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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 http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3f0a84005---vuzowelipebemaxe.pdf In PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae51446a1a---pavokokulik.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/f4c778cea18b2b06dd9b0201646dfe5a/kesigatagaba.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c433ea7cfae---25919285755.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8be469d9d1---gufuko.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/50166309796.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/ffb9f5b263b0122675d354af69a35fd7/30964206969.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160815deac57ce---setuv.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/q2jqpmisfd067cknu5ac97omdo/roburefu.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/dusuwajajatizagesijoka.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/d8m60dg5snst0nj4onvnegj630/dotanudowa.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fa65a922eb691b1feca6c18027a67d97/latatamenisumofo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606de8fc1481f---lejekos.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/79697815594.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c46db557d66---26399609984.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/cf6bbdb4fa9057a89ba1a4c54e8eb02d/wagobuwaporukateb.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/jimafotitejufitolixozu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f3ddc7104ed86ca4c4cde64b6d4a495f/95476596156.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a9d63a41c5f8f6ae26864c9be0f0865a/20058638419.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160787c81e240f---61826069073.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/ur4r3jlsin06i8v798kvn6sgli/11281586520.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c51202d64b6---lafoduvijip.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210606_033451_2699.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/paporoxuvuxiso.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/75163416976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=cosme+store+iconsiamPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 1772 bytes
SHA-256: 61a58908bcd48c70bd4129fbc83bf7e738a8b5e46f17b2bbce60a281d87c1050
font_01_sfnt_off0000e7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C9 10376 bytes
SHA-256: 7260e10e82116a042196ca71dd11bd221762baf6f3beba8d2b7747ae730adf85
font_02_sfnt_off0000ff3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3F 17872 bytes
SHA-256: 88b2d7691f36cd6aed116e277e722d805f726ad13f17fe644bfc25de5d175e95
font_03_sfnt_off00012e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E97 16748 bytes
SHA-256: 3689bdb0943a7a37c63cad6618cdd46166ba9e3a1b02699e017d43f76fd6fc4d
font_04_sfnt_off0001458a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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