Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6a200c5185f0aa…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 16:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cce3b2697ba36e80d18cff89d71400f SHA-1: 8bab1807c0f76224254d6bff1e8c01118e07da0c SHA-256: 1d6a200c5185f0aa9fb547592e00d6fd2af6ed008b05a3b9fbe75be2e3e57ed4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect the user to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=how+the+immune+system+works+pdf+download PDF link annotation
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/23285018461.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/85228651348.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/gt1g5ibaigtn2c3sujftkkrj5m/libanagekin.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/lexidenetaladikifap.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736675d2a0c---napogaxokibifaf.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/61454395340.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/kuzaduwupadese.pdfIn PDF document text
    • http://ausafe.net/images/art/files/27325682712.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bowonagap.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/22360775794.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/39553533386.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/29373412880.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/risaxawulabadoga.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/warif.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8d88f253---nedavajuvipovigopotenix.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/gagudejobezuwilafoj.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/sasufujogasanoxepeki.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/508975631.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/90325654441.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160af0dfaa9390---xarif.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/rb4d4b3v1l9g46o6jqin9ma1m3/labekinatodaruwadoriraxuv.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xezubesuvevi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f2ea2588d---texamegisubatesofaxuke.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_off0000dd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD17 16812 bytes
SHA-256: 146773a932afa7b597ad11222728b66a9493a44b9a57bc28e3e41a34195246a1
font_01_sfnt_off00010815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10815 11144 bytes
SHA-256: 82ede86e97fdbcd69ec35c6b0b351563189469be9945c64ea3b90306bf5c90fc
font_02_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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