Malicious PDF — malware analysis report

Static analysis result for SHA-256 06224211f9420632…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 08:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2627d88f17cfdbfefb2bb2401c84c3a7 SHA-1: da1776580f88c79769e3c9cf2df604c02f6f03b5 SHA-256: 06224211f942063229c45340e9b4011eeeb9bb22a945a91a1893cb55971436db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or use UTM parameters, suggesting a link farm designed to lure users to external resources. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection names indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=pdf+to+jpg+software+free+download PDF link annotation
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/8aj9msk7hvsalqloqn458med97/kapero.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/92029868049.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/lamekimubaxerixi.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/jepojomazuxoje.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d2a501722---rekejutifigoge.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa61f5f355---bomawovivusotatomezuji.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550784599e---zixanogevegudagujaramebaf.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f379fd5eee534daddca7f5b51f225ef6/7454693720.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16095f60a43578---78402271215.pdfIn PDF document text
    • http://divorcefinance.nl/uploads//file/71097702352.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/15667749397.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/83813548984.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/89603187997.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/juxuw.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/21151527068.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/xovenakabutelepokejadeba.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c62ad427fe2e1ab30d3863d017c9d265/wulusafovovukinumunotam.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/fk6k9d621dtisnsapk5hai3rte/lesolelelojisezos.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/73528004962.pdfIn PDF document text
    • http://tencanpowder.com/d/files/60879895027.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/wuralufuve.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/17274632778.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/milokivip.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/826f6cc3488c19be89e39b505d43817a/13800801784.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_off0000d7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 18268 bytes
SHA-256: a7825d4a0ef4962a7347c7020e4e77ef6835f6b38f4f8cb2cd7c25af1b118885
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 10796 bytes
SHA-256: dff41bbf26ec169c776269f998b2688479cafb7c5278d8472f66f942a6e806f0