Malicious PDF — malware analysis report

Static analysis result for SHA-256 4028f2db93b614ba…

MALICIOUS

PDF

72.5 KB Created: 2021-09-15 20:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d66652ebd9454b4af30ecffa1386c710 SHA-1: bbf57a63bad4d1b3c376f74c3d880b3ebcb5d313 SHA-256: 4028f2db93b614bab805ab08c35692ab34960d568214d23ef6ab2acca6b9ee64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The presence of a link farm suggests an attempt to direct users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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 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://laborke.ru/uplcv?utm_term=the+lost+city+of+the+monkey+god+pdf PDF link annotation
    • http://merrygoldholidays.com/ckfinder/userfiles/files/75393749697.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/firelabafalulabikufu.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142077e330a7---31595210291.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/5njr0crgir213g92t27p4knhah/jiziwom.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/dijaruwafeme.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/24222756621.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/tasopuxazisoxano.pdfIn PDF document text
    • http://learningkey.org/userfiles/towax.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/40951037923.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/75800511592.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/lapajiwuxe.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/buvuwevelomavaj.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/voduretemajesejozosu.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/senifenulogapisale.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/51330522806.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/tekewurobite.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210914_608CDE7C0B0FFB08.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/revabipobebapenibirapapa.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2ba6443b6a3d4f143b0b97421be4ce81/29537295556.pdfIn PDF document text
    • https://ratoempat.com/contents/files/dorup.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/wapebevi.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/84270434818.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/44920303874.pdfIn PDF document text
    • https://garnet-medical.com/userfiles/files/powuramolidorerezinerugab.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5de97c2af---4856485132.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_off0000b7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CF 10972 bytes
SHA-256: 4718c2149596d0611c8462b0ab5995bd52bffa38c8107249d1254a55cf8400a8
font_01_sfnt_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 16880 bytes
SHA-256: a1c07da5f8360cd003f618db898cc7174646cbd9856a8b40b93e03d34515c3fe
font_02_sfnt_off0000fc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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