Malicious PDF — malware analysis report

Static analysis result for SHA-256 69a85ccc0a6e43b3…

MALICIOUS

PDF

88.5 KB Created: 2021-09-20 10:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9bb4899bcd6c9383844e32ef07dcf13a SHA-1: 10569ae17e98eb302b8185eed62016e81a08e423 SHA-256: 69a85ccc0a6e43b3a1092393679422d740a498432980e34cd93141f158018d08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=android+games+live PDF link annotation
    • http://wang023spa.com/userfiles/202109file/2021092013494870554.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/81333700172.pdfIn PDF document text
    • https://stauber.lt/images/files/sutexiwuk.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/rulakobax.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/66116877180.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/lolokawifo.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210904004343.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b42b10875a3d48b82af2a6894dea8eea/41906930330.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/36285575213.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/67699984042.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/31791651301.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5c26b68b2---48618195482.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/66h34so2s67ht3tu0ofaetervu/74099103756.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/faxav.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/44546419631.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/rovupirizepixaxatekixiwa.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161310817ab417---29259389039.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/30027025826.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/kekeg.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/budopakukunivup.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/87820554277.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/20805165024.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19cad54bc4c09d7f44e55c589d816210/9812323442.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/71705784212.pdfIn PDF document text
    • http://hk-keber.de/images/file/4034261461.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_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 17220 bytes
SHA-256: 80120be202da093ca02b6966023c2e8786cd3c7047f6e1ba7768e7c0316b90a3
font_01_sfnt_off0001249b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249B 10540 bytes
SHA-256: 65ea9e968e93312d17cbfefe890601a5f762c7c1d470155a1b1ece88cdfa5134
font_02_sfnt_off00013c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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