Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa47ab9fd0efcd7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 22:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37f1108d5d147d374225546d728464f0 SHA-1: 74e111a3d4c5ea30eb3aa2f8143140e2cbe66814 SHA-256: dfa47ab9fd0efcd749e0dce588b8f90f7847c9e7163d87afbc43c07293b46dd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is used to distribute or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/df7fa4071d6ea126b86cf4276099d944/77154205797.pdf In PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93bd1d1a2---bunaneberatip.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/61058800759.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/topizavekogobexu.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/27793849076.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0105b5510b---52631516724.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/rexujeraf.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3d82843aaa8c655155d04cdbfc719d4/vazasarenejed.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/81160b6e709a74d7dc0bfcf26dd7e510/wibiwak.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/cmbm0m7hua3lp3m52uosqk5vbn/29894159472.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/33911148173.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/48427279e9760268a3daad21ef202388/zadolupitavexukufebujozo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c1d18a477---20571759739.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/61479643249.pdfIn PDF document text
    • https://majubesar.org/contents//files/vijapegawipa.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608baeb939607---76411200094.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4729bjunv05rdb1p7bthu6suo1/14299168106.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098445bd199b---gilizi.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/bunimarosufedo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090e15a29a6f---sokorirovareworeviwe.pdfIn PDF document text
    • https://bloomeng.com/uploads/20047827300.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/65896502819.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1157c7b15---fezoperan.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jusujomozovoreseko.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/54875994437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=psychopathologie+de+l%27anorexie+mentale+pdfPDF 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_off0000bb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 11320 bytes
SHA-256: 01b0c3bf637778dd2abb4101382c5e3237adc0212b77eaed860a818589b778b8
font_02_sfnt_off0000edff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFF 16404 bytes
SHA-256: 2d4ce0dbccc101d28c72cff3e3d63b592a05be9b4b891303cbeef040153f8699