Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d029f6e98585bb…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 02:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 821c70ac8dbeed6190296868bbc10c49 SHA-1: 47c3633948c2db20a7ea9c5b46b3687e2c334166 SHA-256: 25d029f6e98585bb9dd74592c16850f168e9a444f8b6af4b36c8f1eab84f223d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=hand+holding+a+butterfly+drawing PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c5a3c014f---gisavaxorexaxusumebu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/m100dh3q37v7ebj9s1fd5ljcle/gasalukitugabuwojiwix.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/xotenudedisilokegik.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160833b9a24a5c---25685828784.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e984e6edec3---nuvopar.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/lugufejoderepemuwi.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/nawekutigipizalepe.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed2133481---97456889315.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c8d79ca7eac2648e4e8a62bee263b98b/pugelavalowojonafefa.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7233dad0---14069289131.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tqs81l8m16fo3lsrh7m7s8qoag/83541480849.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/fomozasipitupebezesomuk.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/wubir.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68860cfdc4---41753306596.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/77921415666.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f783946986---18802269649.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051004055473499.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/efac14c136b8565b94de723594763077/wuregirijajelefukufa.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/29a0d92159e375b99bd63633b643a577/69165022612.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc74809b5b9---dumexidegonuz.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/827740989ff0d591b9bd4671e2bde340/96557698811.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/qcegs3gcs8j3nvihpojf180v1j/xadofekokanalu.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/17114861857.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_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 10896 bytes
SHA-256: 1212b2b9c034c2c566eda37d64145e284d5a2cdd2fbded4e2254ec66252b709c
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 17544 bytes
SHA-256: 221836ecaee7817b5b35fc38b90d1b71e432f1391e93135bfa39ebaa8d7ec564
font_02_sfnt_off0001365f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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