Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c457b1321f2bb0…

MALICIOUS

PDF

84.4 KB Created: 2021-07-19 04:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ccb2f4d6109e4d35144ccbc7c807d360 SHA-1: 1d6beb08d53e6c88ed11729582ddde4838556f17 SHA-256: 45c457b1321f2bb030e33e70c40de641703bb5e2a8667c84b3f0ed5221a8a872
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely intended to lure users into phishing scams or malware downloads. The presence of many distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or track user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://luminex.pl/upload/file/65891453363.pdf In PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/bb5f1a6e68fabb9ddf85e449936fde05/fivov.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083e59a97e1d---kigugerusoxef.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160acbea51dabd---sogixefobamirikusutidogo.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d52e0ba0---tininorikotokugelimag.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/21085528239.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/xevejimanela.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0c8083b872b3c945a9ebe6958b69f3a8/satobalezukotinivo.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/443edd9d74b2d65df95e1b14bdeabab2/6050806849.pdfIn PDF document text
    • http://classtool.info/upload/files/1332021071.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/rexabogage.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfcffc9af7---lazazogeninomibeja.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/31248088032.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe874c5a20---6249489241.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/d167d2e4cd9bdb760841c43153e13d07/20357020324.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/kaxajolusorejozotagomuzit.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/madejolit.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/sujesalumevonoje.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/fozevotalogepubitukolu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/5ssnq3d44bar9qts3etqqafi1v/benurubomuxokebefolaxipa.pdfIn PDF document text
    • http://hibertek.com/image/files/20210624_175015.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gajamigefipaxu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/dh0t1ja73l90vssjfifd1vdrr6/dokaxodudo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a518953a6cb39e737879f08ae09fe56d/35585615308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+recover+unsaved+excel+changesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 16724 bytes
SHA-256: 592162d62b6ca11cc5797ba6dd7691bffe3441f9faa1f577958ad5b6f2883342
font_01_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 10900 bytes
SHA-256: cdbd9729bd0febb8f85a913b7f166269b73323662e923536ee96112e225e41cf