Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9108b9b0c4cc8e9…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 17:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6f4a9c5403e426077afe5b1c2271deed SHA-1: ac3242042e23cf5d808e403c3eb98af821d04cc2 SHA-256: f9108b9b0c4cc8e94d612cb1de32b8f010ab4044be7af297fec35f4ea5e9ab9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports a phishing or malware delivery attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://allytemp.ru/uplcv?utm_term=lista+de+verbos+irregulares+en+portugues+de+brasil+pdf PDF link annotation
    • http://netpost.vn/upload/userfiles/files/sodimama.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931e0bd2e04---wedilolinebuv.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d5ded5854---ganuxibak.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/9vfdpls53ag14vli7e55otj8mb/18382491173.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/11304469920.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/makijumesakejifavobaxe.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/63131095025.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c0139e151cd2b8ab09d03ac17fe954a0/48366317952.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/kuxaniroweto.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/81872087372.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d079857d927---27810819236.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/c844ac0cce5939615cf4d911f999ee67/66965941614.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9415735be52e3052108abd28c8c5d512/suwajaxozezokogutufenid.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/lowadudirarokuse.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/51820620998.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5u7iv3ofn0l7mqo44mdeq9okr1/monudilunonobobol.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/pufiwufotavuze.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/31470f2cec5f79d080da21b0fa5de7bc/36246458983.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b659aedad0bf4c7b0d851b00f5c663e0/99816705183.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/77208258644.pdfIn PDF document text
    • http://absigorta.com/E/file/wejesogokawasobikejotiboj.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/butowalinuleguboza.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/jinilure.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/venaras.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/supudesalelulegeboniniwi.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/1282895838.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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 19428 bytes
SHA-256: 6a985f755b2c8dc65558f2e0c73596a9992312dab48f930ceb76d7570ce0cec6
font_02_sfnt_off00012efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFC 10936 bytes
SHA-256: 708a6b3dfad85725d924c7c6cfb3396c74f17db24f1232817e8b83405acb31f0

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