Malicious PDF — malware analysis report

Static analysis result for SHA-256 421fdc80337f84aa…

MALICIOUS

PDF

172.6 KB Created: 2021-07-31 23:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1d5944427c63c391468f35ba5ac711b7 SHA-1: 3692ce5d95c25acf658be2e87e61efb99e72e0be SHA-256: 421fdc80337f84aa5153b45a7848902979954d18ac506183789330f3135b2afb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirects, suggesting an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wami.cc/data/files/gomumoxabexexad.pdf In PDF document text
    • http://954move.com/clients/4890/File/92771627109.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/b34ukia84e1gdm1f10o1ijqfg6/92020799966.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8097a473b79776444a7ab8e22a68adb9/46335543553.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/62817b20336a3e81e415a80858654884/wibewujefigegon.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/gowelesoxefikajo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bunml1hajkeej7uhe6r4a37o3k/xatigovavizurepinafawu.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d884d48fe2---xitunelutipisedidajovogu.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/81643693753.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/pj5idaqqfrd28am7v9h9ja8be1/45523021309.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/09df26ad87a8566626890d58177d646a/3859996704.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/9262194662.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcabd17920e---57338389991.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/999ot4pp8dmsr6g1766jmrfkfi/77358199145.pdfIn PDF document text
    • http://asustainable.com/global/file/90467043038.pdfIn PDF document text
    • https://bio86.net/fichiers/zojanipimika.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/64132455020.pdfIn PDF document text
    • http://tomorrowhubs.com/upload/users/files/puriruma.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5c7112d9d27355741b2f95addb4f7b1/105149283.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e9280f3321c---48977072237.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/40487444721.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e3130368d---bovevelujebel.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/1348524754.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095bce9708ba---sozedediba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+little+prince+book+pdf+chinesePDF 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_off00022cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22CB6 10752 bytes
SHA-256: e9a9f3100d268774edcef7b91d87d9dc1bc067268b954f3a205f916a17183fae
font_01_sfnt_off00024521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24521 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D33 22840 bytes
SHA-256: a2f0d243623bc564c88f910f8533d1a96d9245cf51386592bdfddded0ef3ecd7
font_03_sfnt_off000295fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x295FA 3344 bytes
SHA-256: 427a8060a563a3bdebdf873348909994299210452b3ac7120b08f1459639bbad