Malicious PDF — malware analysis report

Static analysis result for SHA-256 359504bb61c1acf2…

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 14:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d63c4497018d4b38be3ef6708be437e2 SHA-1: b2c7bc285d931fe57640db517198826b1769fc47 SHA-256: 359504bb61c1acf28d938cf0f633428902ae0420ee0f7ba248f005910db378f8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and links to compromised CMS uploads suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://ketchas.ru/uplcv?utm_term=what+does+itr+mean+in+texting PDF link annotation
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/tosgr67g65dmkb68vvu4ra9as4/rinalo.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/4931650502.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/ruratolakar.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/fujunufudowosarorofebimi.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/5020531614.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7fd2ebdb5---2587533265.pdfIn PDF document text
    • https://kede.org/userfiles/file/siburaredisasibaj.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/hglqainr61etdul105g4c5tvjs/89015849990.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/puzofisenik.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/namojojemokobawaguk.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa9faef6ec---21977872713.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3d371e5a---8007248143.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608abd0576035---sajuzokafupapobagobex.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/8f39b46d9ef9afbb32ef5ba2a4a1875f/bepubagefakif.pdfIn PDF document text
    • http://konberdbio.com/upload/files/paraji.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/8725943290.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/joroxulipovopewaruz.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/jatamelanu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a045510416---kesagelo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/gs8lqsg3hpoiirb73gmci29234/81219506697.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/dilevitilokarojafenozexo.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210826115417_b5vwai.pdfIn PDF document text
    • https://bnovum.hu/downloads/lobudukugorezulakuzamu.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/85491729535.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/novutatodopadu.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/nidakusajowibilulexozu.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_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 10744 bytes
SHA-256: 9481330ec0be144d6e4ff02b7581c43b38ad768f26accddc6f51f4199ad35114
font_01_sfnt_off0000fdb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 18020 bytes
SHA-256: 01e93bf2e7ebbf704edc54b600475e40661be37389d8431db6f49d3e2656a7e6
font_02_sfnt_off00012c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1