Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23f92b797802ed0…

MALICIOUS

PDF

85.1 KB Created: 2021-08-25 17:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8acf09dcd8cf6b4c38673b34935e5a35 SHA-1: 87dc9bf6c403e21e012f83b681acc9cfc4663937 SHA-256: a23f92b797802ed0a1ce5fcf2d24cb1be8beb42862918416a707af884be3ccef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites and disposable hosting, indicating an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://craftland.de/res/wysiwyg/file/157866552.pdf In PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/pemuniduxowo.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210601204648.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/j29se4fk3b20qv0t7oi76kv78t/16233572475.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/minijexasagibipilarureg.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/51540508485.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/makefuxupaxazidinoruvam.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/81568850978.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/20935355649.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/denalenarupofuzarevakit.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/fezazevene.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/po1ct6rsp3n9vinitm97j82go0/87654399206.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac3afc8146---fusiji.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ma77jtk0f8758eah0fs4ghjq46/38939700150.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/68499444194.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/11988627126.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160be31e33d610---21889462716.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730ccf867ea---88691473077.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210622/2106221845303129910zyl4vm8vzgf.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/lhh01tm0deodd45f6ljekhsb40/15146750529.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/mq2jtjsv51p5lkkj5i91ecv633/5084648262.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/sajidogaxafudaze.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/kilukenowoxikagugituru.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/6i7a7a3jpjd47ak4pbu5h4car6/93438963571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+shoemaker+anatomy+of+a+psychoticPDF 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_off0000e562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE562 17536 bytes
SHA-256: d9c2faddca31e4f4b0a5ba13aa66fa3fe90d01db5873334726bd340662d1b966
font_01_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 10868 bytes
SHA-256: 4eade9ba367c9e5809371762e1b6eba76fd8c7389d7efbd55ebdf26b33e34189
font_02_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1