Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b897cbbbdf6612…

MALICIOUS

PDF

85.7 KB Created: 2021-09-07 15:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba7748502fd8a4aaf2bc9247998d85a6 SHA-1: fc39552926138fa23da05c66ef8ea89d463d58ae SHA-256: d2b897cbbbdf6612ad4621f536931380bc479e3bed52e99c49cb73997ceaa397
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=truyen+kiem+hiep+download+pdf PDF link annotation
    • http://brainbond.ro/userfiles/file/jifanokerofuwa.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077907b01a95---96061367950.pdfIn PDF document text
    • http://lucann.com/Upload/file/xemiz.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/76169319709.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nuvewotagarozega.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/87818686028.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/26942292120.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/juxozobuvananawejov.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/27309601469.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3dec9d574db9d47c5cac4c594c0c03b8/48094298368.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/41356536669.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/42079915498.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef75d222a---libilolifiragamora.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/jubadosonaraxegolanarabod.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/bda55d9956497828bb4e21b083c5f19a/filam.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e56cb42deb4---14684312112.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fitojadenitef.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gewuxajowovitoxotegat.pdfIn PDF document text
    • http://zerosquareonline.com/file/32376348225.pdfIn PDF document text
    • https://bloomeng.com/uploads/15990554957.pdfIn PDF document text
    • http://shophouse.info/images/files/sisunugusonujavawus.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/rezexusevudagewab.pdfIn PDF document text
    • http://hotstamping.pl/files/file/47551465217.pdfIn PDF document text
    • https://purefeeling8.com/data/file/menozuviremukedi.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_off0000e1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C9 20884 bytes
SHA-256: e4849304bbb68d260f8f99c0477c1ac05cd9dd126501bc809eae533e0d3eb9e0
font_01_sfnt_off00011853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11853 10852 bytes
SHA-256: 64fef2a10ce11055a1cf62e6cd3f0dd2d4ba55e241889b7b2b3b07c30e5cc8bf
font_02_sfnt_off00013136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1