Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a2ad379b9526dc…

MALICIOUS

PDF

110.7 KB Created: 2021-07-23 12:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c28b5d797542633cb56abeb3710d1606 SHA-1: 78d43578e65cc87f5f36f7072e550baf7026e6db SHA-256: 10a2ad379b9526dcd456d81c6fcf3c11b219f8570a0c0e3d45fcab42b4b0a47d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised CMS upload storage and disposable hosting suggests a link farm designed to distribute malicious content. Although no scripts were explicitly extracted, the nature of the URLs and the detection indicate an attempt to trick users into downloading further malware or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160835150e7120---81623236944.pdf In PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/xawixukasakemugebipim.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0dc041d4---sewuzuxesemubo.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/bevuvevizulemuv.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e372c366dc7---82491044244.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ec29b3cb---26331607978.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/4cda92e440841dae24b2a741ff3d6bd0/wibenejuwanuxusipuvej.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/9cidcrngb1ukldcc2is2220mfi/taroximiba.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/72609541010.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5um4jr44uelbt1mei12p5glivl/28163373416.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f79dbc6df4---xuzibimogezutonevalof.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/152fe90b6ef85adc87ac801548cf86ff/naworufapuvatawajarudi.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/vebinafanofebibok.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160984814652bc---99264394061.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06498c05df8cd705e6c93ea2df527027/37189460008.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/3ulaj255egiqkv8b701t42312c/nisesisenupat.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/jakibifixupematejatuwe.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/ad186f08619a42f1cbb837bf016f0555/wabikupelegelejezovi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f5576078---49050510666.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a979277f0---18853126251.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072d7e9bcde7---99014610888.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/bivegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=special+electrical+machines+pdf+free+downloadPDF 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_off00014968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14968 11044 bytes
SHA-256: a67172bec8b2f782871517189fe9998db3f8790e4e455d69e4869adf102319e7
font_01_sfnt_off000162ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162EF 19396 bytes
SHA-256: de67c692ea6aca788956b143bc86eab05f44cb0e86bf3ad5ca0b68e716a1a865
font_02_sfnt_off000193ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.