Malicious PDF — malware analysis report

Static analysis result for SHA-256 e534277c2555edc3…

MALICIOUS

PDF

73.9 KB Created: 2021-07-30 11:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 84297eefd2f5a587611a0214589e3332 SHA-1: b208acf2b37b28e28efa6470d86cd2ff4745487b SHA-256: e534277c2555edc3fee37d76fcae2f376f80bb4a26289cd09274869cde456f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs pointing to compromised websites, many of which are hosted on disposable domains or compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nomylo.ru/uplcv?utm_term=present+simple+affirmative+negative+and+questions PDF link annotation
    • http://a-pluset.com/userfiles/sikezekapedunakutu.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/38a9c3f0469d73cae56e6d3f17bb53e6/guzojexivalitugukodezopa.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/56607ea36fab818f11e9a8e372d94bfe/35647597860.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/mibopez.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd5736545---zudivuwul.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hgoe6ijars3h81omt1n62k33q4/63504452445.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/dadonelosuzutedoze.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622158202.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2772147db---kobometogopurizozobar.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/defudut.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723f7536b0e---xizifafezazadapimibin.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c50968cb64f---6087052123.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f6da55ef11e59b41c119801341642df9/86952203826.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/17265k2a49sksga4da8o4pgsh0/30240313066.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/l2e7e2vf7i3a66c4psbq0e74bf/67283816896.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20da417ca---vakaletofowiki.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/seribaxiwowob.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/40958977015.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/46658541798.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f18a331d9f3---64083051751.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e85b750eb11---79003171248.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/icbvaff3u1a3svcmic0j2sel92/92140386545.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/cfe3f51cd3f4b9e0f4dea71931fe1eb9/32161152773.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/kuxoxanumekuwotozavedina.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_off0000c024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 11156 bytes
SHA-256: 100807771a6b656b4f699620aead9dc2928f5d763eb051a50a05c9da68cef862
font_01_sfnt_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 15588 bytes
SHA-256: 8caa8f22dd01265ab481d55a03b0801dcc0e8f566efc8402890c7ae13fcb3cfb
font_02_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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