Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e223d4bc18a39e6…

MALICIOUS

PDF

92.3 KB Created: 2021-07-14 07:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d944bfca0bc4160feadbd22c9c1d7af SHA-1: 13b64762a0b49cb4c703592620340cf49fba4257 SHA-256: 4e223d4bc18a39e60babd960951892f68362c1e0da69d4ce5d9404b317e36500
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the structure of the links suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/394b073b16fd7d326a62b5b3770d832a/neles.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vqbq56as942kj7bqonod3i84k1/95099100302.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/mupisovasedelaribejesi.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/44988601839.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/kavoroxovoxosup.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uk15bu78tfg3lm8hnikduleakc/36997952374.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c7efecf80---sakasozavebipaw.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/kuragenusalojurekisazaza.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb19277b34---zerezivuparaxez.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/savumibukuxiwafidelitag.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/xelorebom.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/tigodol.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a189a15cd49---mukaxoneruvozirazorix.pdfIn PDF document text
    • http://mebco.ru/images/file/98540710505.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d005802a5---guwogodewo.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/19349305938.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/evikv6g2o3qg02us88su5qa2e5/fijumulozegosofexabi.pdfIn PDF document text
    • https://jetaime-shop.com/files/wolodepi.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/4888820300.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/29347280678.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/1913954576.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb8ea12766---fonupunorurerur.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097071986b55---gomed.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/27122621390.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/0n7njd79rd1cf1uv5457u2vkd2/xelesese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=pub+picture+quiz+with+answersPDF 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_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 10840 bytes
SHA-256: d1481a1a6c8e05d75d894fcb91a5fd49743d33472050d7742ffcf529e28412b6
font_01_sfnt_off00011cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FE 17876 bytes
SHA-256: f7ee0d73ea97273dd536c9e4ce6ee4388e0ad55f118187b7e386f8fe611577aa

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