Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e2f0d352d2055a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 20:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abc3718452d01b944b1b4889fd7168e5 SHA-1: 5f4e50b5980a30209d5b6c679d9444e6b54ca986 SHA-256: 42e2f0d352d2055a5c735a4178ad4fa2b2d89bd973bfa94e9077dc5b70ec495b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://larustt.com/upload/ckfinder/files/fizakajebifulavewo.pdf In PDF document text
    • http://giayviettri.com/img-ftec/files/mipugokutevudipitinug.pdfIn PDF document text
    • https://promise-land.com/upload/file/dewam.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/4137859482.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/44799735272.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/43171501754.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/tudok.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/97228748763.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/97169cde96613e363d1a57f43e308197/demusuf.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/37970d3d20d6dc72fc7d4234a569061c/suwigozabulujixunis.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/70547661722.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a82bbcc4a7---ledogagejizonutogup.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/kuwuk.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/tobajaxufikig.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/mevakuv.pdfIn PDF document text
    • http://linker-apps.com/files/63597206999.pdfIn PDF document text
    • http://safarang.com/basefile/files/ribumas.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/93791866956.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/xorodogebuputowalu.pdfIn PDF document text
    • https://theipbuzz.com/images/file/45303823779.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/95067734912.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/wukuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=genius+full+movie+bollywoodPDF 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_off0000b7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A1 10700 bytes
SHA-256: 429baa169b24afdf64882dee04cb5d1f31070442a223fad6c04345be3275244d
font_01_sfnt_off0000d03f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 17384 bytes
SHA-256: 9b295c1e35a11c55fea239dfe1079cdf6aa0add5861c4c47f5e3f298d72940ac

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