Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e32725365fe4cc…

MALICIOUS

PDF

84.1 KB Created: 2021-06-29 14:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b8dcea52f930f64baa84755b61837ae1 SHA-1: 7f993b4c2bde23c341f72903b33e3e489ff34b72 SHA-256: 56e32725365fe4ccdf884fca1789ab3c7f996c4f2fa18dbb319a808ad4dd8e70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The numerous embedded URLs point to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a deliberate effort to obscure the malicious destination through a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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+stolen+smell+story+pdf PDF link annotation
    • http://enricobarraco.com/files/toxomomaxaresonosoxus.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe2bea7e67---lunelakuzulumepabujir.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a6971e4d8---91557878860.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/vugutebebeverumidizonex.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607700ab2c509---66244664080.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/91724f4945c3255247dbb327e0406542/rajivonawirudosa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tosiregebovirobupulufi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b2094e85307---78471294586.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/26c404cf5d1ed1ac4697e0ef92172af6/gulakiwozajepumi.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/27468023439.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bc9019d63---jepumelak.pdfIn PDF document text
    • http://chouchoudauphongongtay.com/upload/ck/files/50095421659.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/jixasipurosubedugetabuko.pdfIn PDF document text
    • https://autoparkalbanese.it/file/14067063944.pdfIn PDF document text
    • http://jaatkinson.com/userimages/58555664313.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/66324768526.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/tuwozir.pdfIn PDF document text
    • https://signika.pl/Upload/file/vibudelotomomuruboletejuj.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1b39f7ceb318843a968c5c890ed30464/pozavuxogaduruzilarimi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9d06d518ae729bf4eff080213e0d43d5/99704099465.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/lulotaver.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/433a5e46b7525c76eb83311710fec08e/tubimogizuvarunatezol.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/94700129426.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f866c090c2e5013275c3e49d1a9cc8d8/piliziwesamutifuw.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_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 17308 bytes
SHA-256: 9db9a9f1b7a41a3d355b64c936dbb7c77020ace68346d3b7f86479d2fbec3d84
font_01_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 10588 bytes
SHA-256: eaf3fdf240d3ccbd1df3c2169630eca5156f91e5d65501e51f245bce4ea6f50b
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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