Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cead2fe0c8cec9…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 04:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2049d48214a642fee4c02a6f4066e572 SHA-1: b44418989f0a1349c69593d70ba1a7c2330c4520 SHA-256: 82cead2fe0c8cec962e12f8cabefc8bd25ec0456ed2a26f82fd581a85e9dee95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a link farm designed to direct users to potentially malicious content, including compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attack pattern focused on luring users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=pc+minecraft+download+apk PDF link annotation
    • http://yangpupark.com/uploadfile/files/zumexafedovaridelifejofu.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210920090317.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/tutoparam.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/154641ea852ea52fcdd64484854e7cd6/totunadituledofe.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219131353549551.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/38300341290.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/subapelinojudawewokot.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145252f9ea0a---56786283923.pdfIn PDF document text
    • http://irollee.com/userfiles/file/61855853538.pdfIn PDF document text
    • https://patc.fr/imagesfile/89913846428.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/radutogukotubokatopus.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/gijikasagunudiz.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/5171252656.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/riregetikojojosexamoti.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/97777089473.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/zefedosit.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/9s9jg2bmhnqvcvtrfdor91h91j/50971481844.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2ef93073---41933239989.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/mexasimajulanezekinobi.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/7604431976.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/vegavowavixurapafo.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/rosolugamolele.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/mexidenanuzikesig.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/fuzowozuboworakapow.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_off0000d336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD336 16568 bytes
SHA-256: d82016a7619cf92d5c036bc48caafcb87a9d71a8e7e190e9186ada658def4995
font_01_sfnt_off0000fe23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE23 10792 bytes
SHA-256: 60463027a5dbd714a245f066a6eb1275e759f8c7ebb3a36ff001d2db98c0ee02
font_02_sfnt_off00011705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1