Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d8dfa01ac69832…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 10:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7922022d330d7d6111d491b414e9ddc5 SHA-1: 0dd618e5d0afbc45479bef8af15a4c7f05db632d SHA-256: c7d8dfa01ac69832fb1cde4fb25691a659e3b38960c834810e580244b53ba3a7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on potentially compromised or disposable domains, indicating a link farm designed to lure users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination or to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/poxelemelovesewagewe.pdf In PDF document text
    • http://polyalpan.hu/_user/file/jewim.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuvumabedal.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/gabuwef.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/xowakawobidax.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/53538d2d72a04af3f09aaf0ffa97cd38/nutipaxenaxo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/rozegowajupabu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afda800510d---49871549367.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/wofowolujonoradenokatex.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f7f73c8e3c08fdb29b46dd187864c0fd/zidujadelijo.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/32117226818.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/jojidepizoma.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/4c76bdf72dc811d6bfc78c5228be97aa/38201203934.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c8433c02d5b8045c6c6a3995be827ffb/99050955717.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec412e39a71---larekapuxuwixaroz.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/balugonesafifejavi.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/mabirikapulanolef.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/3512497561.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1610c35ac2b407---dukebaxokivamivewovag.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/53640827874.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/xasoxekemevesetabu.pdfIn PDF document text
    • http://stylekd.ru/files/xuxewitexobuvore.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/291455251322.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/wotanulivawunatevagavuwos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+pdf+downloader+appPDF link annotation
    • 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_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 18108 bytes
SHA-256: 636426d3454027e6a0c2435336ce1317512a0ff839219f19965b02ee4e9cb22c
font_01_sfnt_off00011006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11006 10536 bytes
SHA-256: 740ca0c0ff5d0755e97e9e0deb15a0278a1624336d3042d3bf087068f0f05ea9
font_02_sfnt_off0001284f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1