Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f32f50cfee823c…

MALICIOUS

PDF

82.0 KB Created: 2021-09-15 17:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec511996b8cb31d9c3237ec391afba6d SHA-1: c6d498f00e3a454992a58be2315f5bf0eb4c63ea SHA-256: 17f32f50cfee823c8811bc83d66ad0e1df62e9e97ffbbedd1955e848ec3e2863
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=the+giver+chapter+6+summary PDF link annotation
    • https://ivantomanov.com/userfiles/file/baxujipojomukikejiwumaf.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vevapupuvatobiwe.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4f81c5d83---77379579950.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/gumesobimakevezogup.pdfIn PDF document text
    • http://pronobile.de/catalog/file/jamanexajetal.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161306253710c6---56986807677.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/44ld0hqavf0rofm4unosfs9848/9086703123.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/munasisokegalerow.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/34875945443.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/jipobojozeta.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/66137416947.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/80333098441.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/kejetojowegitu.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/wubamapujusisujolomapusak.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/koges.pdfIn PDF document text
    • https://partetesal.ir/data/file/95409966862.pdfIn PDF document text
    • https://patc.fr/imagesfile/24741996691.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/kozosupulabokososujiwu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161403d26604ed---4179375260.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/68548996818.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/bifumofanevowisugadu.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/28323656213.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/vaxak.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/27905861234.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/xavanivavus.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_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 10964 bytes
SHA-256: 96fbd22b071a31a5c2a1ccf7babb646dc5350f9df6521a77e54a7645d5336790
font_01_sfnt_off0000f55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6C 17392 bytes
SHA-256: f1dc761c501ff962886e1dd24b680854295a1a2cce82ebc18c80f81bc7d1834f