Malicious PDF — malware analysis report

Static analysis result for SHA-256 498031c4742c84a2…

MALICIOUS

PDF

84.5 KB Created: 2021-10-10 16:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8701994c7e36c1314c28ec0737fc82c8 SHA-1: 29cc567f5d3262225731342a508fca99f97dd6cd SHA-256: 498031c4742c84a2012fa51ff483df92d4ba93d1834fc3ca601cb57e3cacf692
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://turkeyinsurance.info/images/file/nomorevojokogulazizemul.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/28871828802.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/65088663111.pdf
    • http://ckm-machinery.com/userfiles/files/39200186666.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ogt9e45jvajco42su7s8p8ds43/sedezelanozofuxunuxiguji.pdf
    • http://ukonlinedirect.com/userfiles/files/79647601209.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/0vgigq9fk1t8v0i2l7auod3qu6/bisozuwomemivegefo.pdf
    • http://santabruna.cl/upload/file/4854296305.pdf
    • http://www.pilatesyoga.hr/files/files/joxajo.pdf
    • http://tianfonmm.com/d/files/xejizijexovenav.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615af700200ad---73156544008.pdf
    • http://greddy.com/admin/common/ckfinder/userfiles/File/gumipodemivutomapidid.pdf
    • http://domario.ru/userfiles/file/85511267588.pdf
    • http://rentaruedas.com/files/others/nejebilukekufano.pdf
    • https://ntiverification.com/userfiles/file/88067748491.pdf
    • https://8cj2aja7-8mxb.com/contents/files/palefiwoxoxunitot.pdf
    • https://ww150007.linebot.net/upfile/files/20211010062511.pdf
    • http://orderkai.com/uploads/files/sadusesutiniv.pdf
    • https://marblobathware.com/app/webroot/img/files/72959008561.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/49905204305.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d53c82a9a7---gesibibexizisixuvadi.pdf
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/tikexoxova.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2994bc77---vegifewor.pdf
    • http://www.eau-msu.ru/ckfinder/userfiles/files/kuzopunegur.pdf
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/77745556241.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sister+birthday+wishes+in+tamil+words
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da35.bin
4de35fb11c0e89de93c3e1da6f56123c5f987c5dcbd937053395b8f7775d4fc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 10928 bytes
font_01_sfnt_off0000f357.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 16792 bytes
font_02_sfnt_off00010b69.bin
fc1ae2585db5ca1116ca0ae4fedde58c2b4812dcf1b29626c67c8751f0880b3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B69 21880 bytes