Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb45ce821e0ce09…

MALICIOUS

PDF

74.2 KB Created: 2021-09-01 10:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 243b9a8f9083cb2dc6aabf626762ef8b SHA-1: e01d96aaa9f6a6a361e15281dae20400253ec0e6 SHA-256: adb45ce821e0ce0999db46c3938835619a81aa8d52b1d781d1d8aa9016e1a17c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of these links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=the+waverley+brewhouse PDF link annotation
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161124aac14a5d---28918631071.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/924b3d95aac67238a3107646de92e4b1/6773423243.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/1q7pipr0ahgbtba2cuqmg4kt44/51407981897.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/63637673146.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pr84hl9s7bmehokm53fsm2pb55/53410907688.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940b1bc6d96---kajurodewovimuladamupesiw.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/98303534297.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedf7bb88a---suruvagodoxamuxuz.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724ae066a63---kebibobope.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d81eda54c53---kegutedidibi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e7d3a920d66---20149545924.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qgj40i294i4vrg5pgieneg7f3n/sikerirugimiw.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160771e9330c1a---16350805860.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/uu5us051joi9etpqosq5vlssvq/wifosaramizenonu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lutuzipovaxamijoz.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a479335ee09---lizafivepoluroxefejafifi.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f98376dd2---1855498606.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/53748990166.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8a4288d5---46691098004.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/fafivoxeru.pdfIn PDF document text
    • http://lucann.com/Upload/file/61492179727.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/pilefadatipijovomakiwigu.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/tebivopofa.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/22977401053.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_off0000c16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC16B 10380 bytes
SHA-256: 1ccfed702fdf45500a0d3f19ed705b335d941f4b4850651889e2598336b34208
font_01_sfnt_off0000d927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 16336 bytes
SHA-256: efce6eb6f1d105e9c876d33c3e3a903eab63a72794a69001082ade0435c33ca6

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