Malicious PDF — malware analysis report

Static analysis result for SHA-256 4776ab8b1c59b517…

MALICIOUS

PDF

90.9 KB Created: 2021-07-04 10:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ad5954da6e5e25e2ea7e5aeee098f42 SHA-1: 5707de7e3db899778a6e6c2e4fd62078e5d8fda6 SHA-256: 4776ab8b1c59b517a99c95cf35deff1c5b1089133f73082285ae768962a0aa09
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b977db4e732---puminivevojugefodaperusiz.pdf In PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/zobenuxoxesojomut.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/52142435980.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcda55e50---lekinitumikapajusiso.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/zopevifaguruv.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/aq6r41p3ec7ulp4rg9mfl80pv0/xexumajiwosetamulorijovot.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818c064e967---92211031216.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607927ee3b49b---tezafawunozemijidelazoj.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/zotoranurorigafumiga.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5a1544b0---30291953702.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/mesudewubadasowuvumogulu.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/pc7leg143b2dqs0l1enl23v2sa/natis.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/zugidusoviletopujavojola.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xelijefegaxibovumawixus.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608686e581f51---92650499701.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc508efa87---tanab.pdfIn PDF document text
    • https://digireg.org/upload/30740454180.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f7ef9d0270a533115fd2e4f6dca9f544/bexewifatonun.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/judofibukopesu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc895e90a2---64754271242.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/52357209784.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/53366361048.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/b63168b11ebf7c69b54f09fd2c6ff9fe/pinanuxikesesu.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127621093d---gufofob.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a769c8a14fe---gedopelef.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8467a1f2a---33653659981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=baked+tilapia+with+panko+and+parmesanPDF 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_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 17996 bytes
SHA-256: 6d3ab9f369602aea4f5b961977e7d8d9d8f9d408618b05a5a5ce13a65ac0485d
font_01_sfnt_off00012ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 10888 bytes
SHA-256: 1b343c5eabafa74067905d872b4d5830288cc4d9cb3a21a14668d5fa9aa4ba96
font_02_sfnt_off000145f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1