Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcab623311c141b…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 11:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 462513d4391f8bd2590712651c6c53ba SHA-1: 7644c48c6de251a326c055386f2334c9d34c068c SHA-256: 2bcab623311c141b2b77fe53afed3d6ae4a9dc4bb851724e622c6af0bd2318ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS uploads. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://produse-zilan.ro/files/90188804552.pdf In PDF document text
    • https://j26clean.com/upload/files/votiki.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/3667217693.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131baea24cb6---1588551777.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/loxojusoto.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/xukolatujirun.pdfIn PDF document text
    • https://edusfera.pl/upload/file/73891620306.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/92847446027.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/lomemotafuwin.pdfIn PDF document text
    • https://el-tall.pl/pics/file/zidoli.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138315313aaa---norabosaxesibibuludu.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/zujumosuguvenapafiro.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/50657239978.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1bbfa3ac6---bogasilafebarawapizi.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/92738039899.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/volaselinabukedotib.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/70731576516.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/46817979900.pdfIn PDF document text
    • http://sbairs.com/datas/files/67623030300.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/paxamorigelarisubudine.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/57090607448.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/10058735787.pdfIn PDF document text
    • http://erictex.com/ufiles/files/zukerobipaluremekewuso.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/jasuzizokasuwefav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=apps+to+apkPDF 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_off0000c533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC533 9844 bytes
SHA-256: 02a122f3a84828299a1d84c08b548e422131135ee906bf4231ed6c16b9eff780
font_01_sfnt_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 17576 bytes
SHA-256: 14f153f1c14ee862b3159ff305c025e85e78e7f2d7c6661f5e72fbfea5c855c6
font_02_sfnt_off000108b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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