Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c0181ac4e5b176…

MALICIOUS

PDF

80.8 KB Created: 2021-08-17 03:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30adfc2e2393613e519c1078773b283d SHA-1: 364c1405fcce93b12e95e5378e0211ad74d2ce13 SHA-256: 76c0181ac4e5b176185edc95e6baeba8996680c1796c78a33821f8357701dcc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, leveraging a common spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=assistir+50+tons+de+cinza+filme+completo+dublado+portugues+youtube PDF link annotation
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/99680522927.pdfIn PDF document text
    • http://novichiha.ru/pic/file/zorikejuzog.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/wolelegawisafixelaxevotim.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/nutenesikusup.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b60f90437dac706fe61f3b37e6a4786f/43698078288.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/1c97595ea0c0beee4224cd6006dbecc5/87932947806.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c1f9115bc620704fe1fb95b687dc538a/mukesabevilinakifererawad.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959537504ee---saforow.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4506a836f211c101d4aa8383280c34e2/2272908734.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0be1a9d2---diputokig.pdfIn PDF document text
    • https://santechnikosdarbai.lt/images/files/91259732898.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1b42d236---gelekonebabuz.pdfIn PDF document text
    • https://malikcolsys.com/userfiles/files/sakubanurizixatumabubos.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/budexinuwefa.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1fbd4cc43ff0730a02b78a96ba7a7265/59270526727.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3cd98db3---xuganakosizugifewewo.pdfIn PDF document text
    • http://dalaichau.com/files/89107072537.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/feredakofetop.pdfIn PDF document text
    • http://scarpatti.com/files/81532868251.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106171106109123.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/73862440131.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/76542940702.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/63281867111.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ebc785c9979877dac9cd08f993aa824c/72357384620.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_off0000d171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD171 11616 bytes
SHA-256: 4b3558ad8c4b1396750769778883013fc6b2a118f38b8e4e9e80ed68ae6beb95
font_01_sfnt_off0000ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAF 18956 bytes
SHA-256: 949d2f483a015c539ba4c4c40558341a653cec51785ab1dfed4febeb0e6c87c1
font_02_sfnt_off00011b45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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