Malicious PDF — malware analysis report

Static analysis result for SHA-256 7657f5753299ba5d…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 23:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b81e99b7d00d1651c02a356aa8bd4ef6 SHA-1: 716d59d5957171cc4ce2854aa763ff60596d81e7 SHA-256: 7657f5753299ba5df5d6ecf8a3caef50d99ad4afca44f087bc52dacebaeffafa
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=tutorial+adobe+photoshop+cs5+pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04d5bd35f4---62466134990.pdf
    • http://ronaldtan.nl/images/photo/mexizatopil.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd37433b34---12656051426.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/69616457239.pdf
    • http://ud2-140.com/files/mupiwimisoxowuni.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/mimilukaguruji.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611475df7fa68---mubekukelotatawibejupulo.pdf
    • https://promise-land.com/upload/file/xowutefigevexiwudapoduj.pdf
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/wilimebexadojufisanilo.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/kmfp1llkc0hcousqncien86s8j/kewilup.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7cbb4e02---musupopipetenijemapikosu.pdf
    • http://dakmet.pl/upload/75042349077.pdf
    • https://aokman-drive.com/d/files/86507689329.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160985a201fecf---kexesanoralomejotag.pdf
    • https://turismopontevedra.com/ckfinder/userfiles/files/6280727545.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762e0cc659c---dibosedukixepopaxibosaji.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96ada5c225---1834808591.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55aa90f68---50998089823.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/312e4c445009fe70c2eed6930381c77d/sivegarogasafatifonofatof.pdf
    • http://alpha-cp.com/userfiles/file/72069154814.pdf
    • http://stark-tools.ru/images/uploaded/71746376065.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d805d727---redokugudefolik.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6ceb5d96b8979f2f2c4237943fa50c59/12895728411.pdf
    • http://beijingteye.com/upload/files/87309586098.pdf
    • https://neksav.com/upload/ckfinder/files/duwivuwiboxixupukefe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5cd.bin
775b57e807c85966206ba0b7a874c50e3ecf3ce86f730013eb2e559af057a45a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CD 10948 bytes
font_01_sfnt_off00010f20.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F20 16792 bytes
font_02_sfnt_off00012732.bin
17af1fa0969bcdd569c0b14521ce90e5cde85e590ba480d6949fda92e516dc85
pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 17672 bytes