Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc7a380024becfa…

MALICIOUS

PDF

87.1 KB Created: 2021-06-26 16:42:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4a7221d82c615bc9d028ad1d0cfef2ce SHA-1: a6c62167e955d19824e884826113fd68afea7bc0 SHA-256: 4cc7a380024becfa391b57300faa4234633c34cb189ad1bf2eb542f976f0ec56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 numerous external URLs, many of which are hosted on compromised WordPress sites. The presence of external URIs and link farms suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://huntic.ru/uplcv?utm_term=watch+sons+of+anarchy+season+4+episode+5 PDF link annotation
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/7f4p6k6urgoioc1il4kqutq7d3/56085838570.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/615150b021138eecbda9c39b4331ffd9/bipamiparovejejixofujo.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/69014732300.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9997b3030---zirosilazugopasapovile.pdfIn PDF document text
    • http://jkohut.pl/file/sajuvakikewuruvuxejofaz.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021516239281708.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/gajezoluwebuwozor.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///36875075057.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/24606192811.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8adcbd58fb11a53a280547c9b1766fa6/komebesatufelawakibolafe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1c20514f---87033959482.pdfIn PDF document text
    • https://mimpishiodua.com/contents//files/64626480350.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b892120516b126a0c959dd2bab6ae8a2/lakivojejojes.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kifobami.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/gns3hmrrg1tt4q2uv21ia19p70/wonoguw.pdfIn PDF document text
    • http://fotossc.pl/_files/file/12189631209.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c8efa00d6a32e5d63bff4b0ad0911f09/dozebibosudezewumagopu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03db6e3f4b---28434688238.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/68663220739.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/60e92ec8a52b83887fba36538bf53e57/poxepejonurub.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/3c82e206308808b2403593980b86696f/46910518252.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/798500bb4973b02c3e952c248ee7107d/dikadenome.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/vijozugalelirufelegus.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2b2d08d97---342293361.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/95512287956.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_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10988 bytes
SHA-256: 36605f43523b1b975280301ab60961ce1df7c4fb1e287538941d91bbdbf9ec0a
font_01_sfnt_off00010810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10810 17696 bytes
SHA-256: 463f34e97a9bc7909399849982783455ea2f343539a99fad5c63d12974662230
font_02_sfnt_off000136c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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