Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a07652b5b6f035d…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 13:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39d34510b0efbd8a642cad8567cab923 SHA-1: b1f8eb5a637e0b3d82637aad6ac382cf81d7b6d0 SHA-256: 5a07652b5b6f035d74ebe43c7a1ae7154e6050909432ea8f85e8be16d45397ad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, detecting it as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various domains, including compromised CMS uploads. This suggests an attempt to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/povedisatuveboburolut.pdf In PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/guvivivamakirut.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c1764e8bead---sigesisizegafugipipogu.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/vapawawebutijixe.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729e0905907---napikikitafuwobubixumap.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/sotomutigigejedo.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/xifizaloxow.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/71495566715.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f54df663b412818a984c9a44961f8b79/simibutoliponaneke.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b97b06909ec---99024210775.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23913d4e56---25631269333.pdfIn PDF document text
    • http://abnicum.com/files/file/jifuzogejap.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9f76cee4ea3ede192385e727c93ec733/22226159968.pdfIn PDF document text
    • http://ilkemymm.com/image/files/70036165852.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985cc4c187a---90076560034.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/56024829172.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160854075108a8---vedopu.pdfIn PDF document text
    • http://erictex.com/ufiles/files/domitavo.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/sanosumidafikedizodit.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608296902ce4b---wesevigudokowomifikuroxi.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/40872371237.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/77665706910.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/0584302644d68323565ada6616d10565/pijovemu.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/losoxon.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/7h25dvper8vf6hu9kffm34ghbp/98625173351.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/98832448997.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb19864dee---90408100756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=swami+dayanand+saraswati+book+pdfPDF 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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 19072 bytes
SHA-256: 3e558f8a47190b9b2bbfc70e251108534eb3ce7a9cb218cf48b3c1d2b2543272
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 10988 bytes
SHA-256: 25b36ca4c7d62ddf4d53dfdda7c3fdcbd8b0f4620e5336e183daa5c37a022945
font_02_sfnt_off00012424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1