Malicious PDF — malware analysis report

Static analysis result for SHA-256 19dec74bea198dae…

MALICIOUS

PDF

90.2 KB Created: 2021-08-11 00:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a0768f45703b4ff342fbf4520705d3ee SHA-1: 81c843639802b5f70e7200f6c129547cb8587b16 SHA-256: 19dec74bea198dae387dacab682968be8938c3dad6d052b6b1b7cadf35a37655
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting domains, characteristic of a link farm. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content hosted on these domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://noavarservice.com/ckfinder/userfiles/files/papejuzejajivakovodivonex.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a43e3ee9b9b---jitorufiwibi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d976df3d1f---99653394328.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/giferono.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/21576962750.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/domarijaruvadapusekuk.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/gilemakudopij.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/75092997689.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008dc4e42c9---45149061272.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f4cadecf---foxuwunomusipofanem.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/79198997128.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f64d3d392---nenubi.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/9772869572.pdfIn PDF document text
    • http://ymmicro.com/files/files/18397015539.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c72319c49dd92536294e88e93fa3012c/23111538619.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cc6370252---watudofugob.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/15489519837.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc63e068b6---ribarofetiwotoronutodu.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/23331913254.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/80697050768.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1916b103b9---97716581766.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/66632376756.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/43884036754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=where+does+the+drain+hose+go+on+a+washing+machinePDF 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_off0000fad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD2 17080 bytes
SHA-256: 991918da02d76d351c6d5741515d9ec8482c101ffe31491bdfccd799df4a96f6
font_01_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 10848 bytes
SHA-256: 236f580c4e26a357a004a864fc2136ab589aee70959a41cfc372ba38b77658bf
font_02_sfnt_off00014009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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