Malicious PDF — malware analysis report

Static analysis result for SHA-256 42143fd3b7061938…

MALICIOUS

PDF

88.8 KB Created: 2021-09-15 09:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac8fa25809eaf39f738fd4f1bb8c6eb2 SHA-1: 8827b30a82704dbbb144f65b465b1caf04922bf6 SHA-256: 42143fd3b706193834eeae0544eaab861931ce093f425dce38e8925b963fcba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=aplicacion+para+modificar+tu+carro PDF link annotation
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/gixatiselo.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/jotelepu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba114f914---17323919117.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210902_8B614B5CA34AC895.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/28676881195.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210904123505.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/b7b6347fab822f0615d0ad32ee88720c/wigemuxexetopipij.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210904004701_1057975035.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/kululotujoli.pdfIn PDF document text
    • http://skupka54.ru/upload/m/79670714160.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/74672861440.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/11600353351.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/zopekuwegamubub.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/wuzodexejovutisap.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/44239969516.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/niralotisoto.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/11001585478.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/97861007348.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161408f333ba22---34724847822.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/nevararip.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/40842844387.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612fba4001024---pokodebatesek.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/5001419808.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/50841443290.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/19757995600.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_off0000efaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAF 20544 bytes
SHA-256: f5583f728b73c78cab50117ccab98cb313ad808d6d96d0a96a469e1a0ccc3c42
font_01_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 10564 bytes
SHA-256: f2b1c3df72e7bf7fb2302285f92888a91e7e12c03ecc29ca75ec1916905ddd60
font_02_sfnt_off00013c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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