Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a1fdddc3e2214a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 10:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9208be7aeade1193f4541a2bae18db35 SHA-1: 60f1800769e88edcd8abaf431fac163ad8ddb5fc SHA-256: 77a1fdddc3e2214ae687b985f21a7246765281716286aa6b52b8739877d63a8b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS upload directories. The primary URL suggests a lure for game cheats, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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://nomylo.ru/uplcv?utm_term=subway+surfers+hack+unlimited+coins PDF link annotation
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/l4noouqc14t5lpcecj04c4kitf/ritadelazaxixowasi.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161370ecbe0db4---40773873465.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/fokabawumosuweja.pdfIn PDF document text
    • https://electroagro.es/pub/files/43544812394.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069ba186fa---sitebagiruxavaru.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210901075705_904477154.pdfIn PDF document text
    • http://zeci.nl/im/image/32787922126.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408ae6306e3---dujozu.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/355555433.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/73579358395.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6c9e8134---koxalewexiporukewa.pdfIn PDF document text
    • https://value.ae/userfiles/file/9809381298.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/dalaxoxa.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210903032327_1522024910.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/14193638290.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/75907339229.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/63471900483.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53228190927.pdfIn PDF document text
    • http://jainfarms.com/uploads/dezubijiseb.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/tetabimexeji.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/29395394478.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/kejagus.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/abb8897fa64c88ad424a5903539b2129/42760436038.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/96698263264.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/71887031789.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_off0000cd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD17 11348 bytes
SHA-256: 64109036e3fe5b3518579dc445b90f7953e39b6596c7964cd618a71bdd38b6c5
font_01_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 17176 bytes
SHA-256: af47678988a9f11d73eed8960e75e2d37744fed93c28fa2dc293a8d1014c15e6
font_02_sfnt_off00011407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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