Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75b16971a60e9ca…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 11:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1b577f4deff892f67ae3bcf1a3dc36e SHA-1: 60f59b3104d4f5f93cb6224fdfcc57bef57777e4 SHA-256: b75b16971a60e9ca0afbf023bb357763a1e43e326da4089606d356c5eed8fe3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, while some are marked benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c18a30e96b9136312acbece986e5805a/44156888710.pdf In PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16134c16041aed---81350580301.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/jalirerifuxogopojolowen.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161393ea0929ad---tiritiburusobafasaji.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613870a291fff---86049335022.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/73978040467.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/55504102160.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/66574780193.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/pizutodonofadumi.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/55818511249.pdfIn PDF document text
    • http://carbontuning.ru/file/71348752550.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210902125515.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/depubasataxubuxix.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1277288316532f9416d161c5fee797cc/1182896128.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wuduwisazivesiveruweku.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/wagaluj.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/wusajanoweropuxajat.pdfIn PDF document text
    • http://tai-group.com/upload/files/88258862463.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/71178130351.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/8u75snbmvi15tvrqfj73hkutq1/91569299936.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/44535285628.pdfIn PDF document text
    • http://pb-book.com/user_file/file/badoludepusekijadef.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339001d8990---83595897221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=young+tuner+movie+appPDF 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_off0000bbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE0 16944 bytes
SHA-256: b697d5579f3637f0fb5172cb34a469c52483bdb567c9753e5a14a495591162b7
font_01_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 10528 bytes
SHA-256: f4c991dc4e4382a06ddc15c710f267fbe17dcec67a39e4efc92676f1808d5656
font_02_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1