Malicious PDF — malware analysis report

Static analysis result for SHA-256 306906200391b126…

MALICIOUS

PDF

73.7 KB Created: 2021-09-07 01:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2dd60d05379ac678970b353bbfc4f31a SHA-1: 9eadd9a8caa946702a493a8a54c2273c4b3b57f3 SHA-256: 306906200391b126f360ab0e75b0ca6c317d1a79bbce8d368d9d54d5e4968145
156 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crewmak.ru/uplcv?utm_term=pdf+ka+full+form+kya+hoga PDF link annotation
    • https://esperanzadeavila.com/fotos/file/67333525641.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/komadesofepelofew.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/2598429613.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/bodakameg.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/gubotixaviwa.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/saboderatetiladumi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/qlerhojuojb7las5kef0ii0ue8/gizomabazikawunesinufixik.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeb8b737d7---33695341031.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/94402746243.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/88f9b9877c4e139e18b57a4155da70f8/joxisozenatudikilewu.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210731_145809.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2c3716fce657054535b42681aa004aee/pemonevobipowi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/lerigok.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/867957475.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1964fc1b79---57669682037.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/1uuca42b34j7lg0indg8b3ss71/15348970917.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a948df54eff---12884438058.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/18353886067.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16301248530493.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775548be795---xosuza.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/90246204502.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d96be1e1fc2880b78afd2aecc84b64d0/fuvurusekivam.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e2021ce8---gexivenan.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e3446bc7---25576438001.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_off0000b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EB 10512 bytes
SHA-256: ec3d5e30b59d3b0272fafaff43ee2d9a449299dbcd218c7fb11d4272ac548461
font_01_sfnt_off0000cea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA2 18540 bytes
SHA-256: b9efc46dacc9f9e1e3af95314ba04b5c938c0ae59162181072072daa2f71c655
font_02_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1