Malicious PDF — malware analysis report

Static analysis result for SHA-256 035f70d57eede4cd…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 03:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e5d7e3f79b3fbdaf64d3a27f1c276541 SHA-1: e8ba3eab02d759628bbcb3323a2deaeae432b7b3 SHA-256: 035f70d57eede4cda72e318b9d73507038f22b269c5c475f5ea91d814f20614b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it is used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=telephone+directory+adelaide PDF link annotation
    • http://gurolmumcu.com/userfiles/file/wopodudaduzef.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/98752667185.pdfIn PDF document text
    • https://mallenmediations.com/mallenmediations/images/userfiles/file/dunijomupugofosavosal.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/70277672074.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/181245138236.pdfIn PDF document text
    • http://spakimthi.com/upload/files/83350415553.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd8c82f94c4cb493c8e1f39615b8226c/rokaki.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/65639035837.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/47737411489.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/narepupiriwu.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/sekikoxedapixakagaxitul.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/xadalo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161399c896f764---39575132789.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/mizezonorudiminu.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/53904270070.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/naxamewumelilaripegemusok.pdfIn PDF document text
    • http://benly-carson.com/product/files/18837743749.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210901110842.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/jenase.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/iqjnsg5ue510psv9bq0pnk6ats/kisumuxerojaf.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/lukakewijapejonab.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/jewalosojet.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_off0000b236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB236 16000 bytes
SHA-256: 21521654da55bfeed03f91ac0fe180c5bd6a9b3f68c49314f4e9f7a66ace3e89
font_01_sfnt_off0000dacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACF 10520 bytes
SHA-256: efa6422fb3c4e8250dd0632da39d243f8c17a7ae0483fdac348bceb18056ae0c
font_02_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1