Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa27aaa9affce71…

MALICIOUS

PDF

73.2 KB Created: 2021-09-05 09:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c32e05e38ee40aefff3a0d9b126d75b7 SHA-1: d8185395c1ed1abfc5cc26fc011f9c0bed4d100d SHA-256: 7aa27aaa9affce71dca9265acf000ef1bedbd885256503f95f4478c027320ece
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous URLs, including those with UTM parameters, suggests an attempt to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=theoretical+hydrodynamics+milne+thomson+pdf PDF link annotation
    • http://php-lounge.de/userfiles/file/bumaxu.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/nazusuwidudedezelezijar.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fddb0c74139---32578884694.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/tenenupofaluru.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4848f78f72939efa1c03d51d4c4eed5/mesenaxebibajanomoda.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/datipigedolarev.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/vuduwisamotegazin.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/24942184548.pdfIn PDF document text
    • http://fittbike.hu/files/file/tavisapekodarazuremerewe.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/bokivogudowegorediwimuke.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/pefabu.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/53833738403.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/78079730528.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/busoworimalupemalitek.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/lewitoxasudapovunu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/jno1pmm3k6ormu94s9le4rb6uo/jigiwinapofased.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/99a3f54297d436682f6e3888f1604b66/senapesij.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/84286319964.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a117af69e97---zojud.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f69ea30cf9d4f61411a3a2bbc8a2e816/gigux.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/duteruwimokejetilubix.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d72ace60fc5afc285ab709731d7ca37d/76176855909.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/5c05fa9bdae87eecdbcb80addaf0fe92/tukujosezaxubokoz.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_off0000bc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC10 16228 bytes
SHA-256: 33d52952d21a39e834bd9d3bacdcd3b9169fb7c2407ac66360a5ef9a457c72b2
font_01_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 10960 bytes
SHA-256: bddb766bd4596bbed614b162895cdf49ce6f6c2ebe1e2fbbf2c8e54313b1330b
font_02_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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