Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae62141b13f8f7e1…

MALICIOUS

PDF

86.7 KB Created: 2021-09-02 20:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9dbc2af8fa113e01501af02df9b381a3 SHA-1: afeacc7a768c1ab035edfbf4f8b5752d01df3097 SHA-256: ae62141b13f8f7e1accc5f630c0e41a2ce0c18b21fd10337efec3f77ab980f83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/9694175475.pdf In PDF document text
    • http://bundoreh.com/fckeditor/files/file/wipejevaxurazumivo.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ab49d7ff0b7a2e7d8f255076945971ab/jodubulot.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/40222314905.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/92672496875.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/24157105582.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/a42ccf8f91b208d1584f37379f5603df/gowakan.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/beluwokenudisuronivod.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161171ae125512---22852488487.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/93344615395.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa59c442fea---99570328731.pdfIn PDF document text
    • http://zl369.net/userfiles/file/xopuxitosunepik.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/79d8df25ebda9ec8efc27a96a07becf5/biwunogafukawolomuj.pdfIn PDF document text
    • http://midesignvn.com/uploads/files/xugorevo.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/ketowoxifod.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/22019500324.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/4582174955.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/foxipowipiwadosomerovegi.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/89899679748.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/75857491687.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b8471a12---kominilisanurire.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/pumh3694gsdq7rgcjfkq19kjuj/13744581242.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e604a6c9f57---vuluterimuzalapej.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77dc73cb0---66150581838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=secc+list+for+landless+manual+casual+labour+survey+biharPDF 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_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 20856 bytes
SHA-256: 3f4fbfb5439a1434be332f1ef0fad5ff5c925dbfb5e909dd6b34f0ffc13b417b
font_01_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 11236 bytes
SHA-256: 8d5390d651f926bc93bedf7171adc68641521f51b2ca37fab4c44df1977b282b