Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f9b033b069cdb0…

MALICIOUS

PDF

91.9 KB Created: 2021-07-04 00:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc5ce94ff9fbb9db5244d66d9fdcf01b SHA-1: 4368cc7e4ed81960f8f30b879b7b833c807efa2f SHA-256: 98f9b033b069cdb07ed3000d455d75ccacd9cb7529ac4cc532a4faa2160a3a9a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly suggests this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/8177ed5270293bc11e21515df382ab74/gofubanulurumusegomo.pdf In PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf6fb77c81---27110897997.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fc60833ab---44029312381.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093c1b4c4cb8---semizovokoravitufopitod.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085edaf34aa1---11410683996.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/79b8daa35b2937707320cdbf94eb8e7e/koxeruw.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ph9pe7i4cif8nudjsjnj8ci3dl/jezekujipejizuraxupaluw.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/10766099541.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210510041524933.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/1b7b86d0896dfc895d7b235ccd72efd0/lelureduj.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9894547a8---relijolaxerudisamifemob.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/tagomeke.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c4420ec89179103a126156419c1edae2/xenadenogezimemiwafire.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/2cccb5752582792f5500c965927a3590/34255989945.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/60807374572.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/lujiwikubokirajikugebasos.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/satomira.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/13756480432.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5962719f949330bed6ed198f319029c4/45684947259.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160986370c2234---35841873763.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/2b18eb535c23f08cd96dc8b6c51ec7dd/9129207559.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/tugusukejedefowolakovowex.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0b3h6ikk57n6f7tuoba9kugkm3/98538080058.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///dejugudek.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e7ff67681eb93f35039c55af7a13bbc3/gofirukedep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=notary+public+loan+signing+agent+salaryPDF 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_off000101b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 10880 bytes
SHA-256: a687f4abb3677032e5a7b36045081c212fdc5409ca00c8a8f254475b538b1c82
font_02_sfnt_off000132e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E9 17412 bytes
SHA-256: c6269ddc15ecd779ec37ecd5844345f0ec2e760b7c8171f575ea19fbd51a7ed1