Malicious PDF — malware analysis report

Static analysis result for SHA-256 df553cd115e5e181…

MALICIOUS

PDF

86.5 KB Created: 2021-08-14 08:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8cd32023ae78bca6a46126fe4e885a82 SHA-1: 1956fd7f963870a90bd1d24f62c334001ee6ce86 SHA-256: df553cd115e5e1818769f03de5e954534e32a1e06c5749a1d0d7b0992cbe19eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to distribute further malware, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://krisoc.ru/uplcv?utm_term=how+to+write+a+positive+employee+evaluation PDF link annotation
    • http://pagyesa.org/userfiles/file/20210622020954.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/suzoxigator.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/36a9a7b481f95b7b4006c9b2aafe254e/bolegigisifen.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b129626b8---49014225062.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/foxotasuwobudefabarogora.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/15371315765.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/rumez.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abae11de67f---42859715387.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/41e8717faba2312e6423b5cf368ec818/51842372972.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/48814935564.pdfIn PDF document text
    • http://njf724.com/basefile/janatalnajafcom/files/mudulugox.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/62950429829a1bc1af4f180e5a5d5e83/78702917285.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/17d0245c8a27d7f806782dad7ebe5054/wegatagatisasulos.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/94e40f8cce6912712cc5358323b2251b/73099818745.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/35592205124.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/jatadedoza.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29da7810b---47387889497.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93f575dc65---45184391097.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wunatitinaxipoz.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac730dff06---pumulatisabikijuvifexi.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/20853a42328354275cfc9603e37cb92f/galenisinitapujexiro.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/felizimofuwosisefekopatu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4e58a33542824f9059c174a49eab9b18/54668078020.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097472c1a7cf---buzakapaxafin.pdfIn PDF document text
    • http://waypl.pl/upload/File/vepusarobixetafisigimori.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210628_F01BB500A0612699.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_off0000ecb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 10772 bytes
SHA-256: fd563a2289c602a18afa028d93bbf4845d3022defe42f055ca62db543c76e72b
font_01_sfnt_off00010583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 18240 bytes
SHA-256: 6c6d5193159aae0030fbd7fd7dc7d04ec372f8820c005bb257cbd7cc2fea12b6
font_02_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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