Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf89172b757b7c9…

MALICIOUS

PDF

69.7 KB Created: 2021-10-02 17:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dd23a1e86f9900c535059a0a00b2f6ab SHA-1: 80c07e3d29f2a92ae6610eecc014140346de6d58 SHA-256: 7bf89172b757b7c96182421870b5f0f954202f56ff8495577c961b29ea2f6697
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://queure.ru/uplcv?utm_term=give+me+the+definition+of+condescending PDF link annotation
    • https://smsenerji.com/resimler/files/rujelir.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/tf1udh6irsdgjthnreat8dinbv/zuweda.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091523584673499.pdfIn PDF document text
    • http://anpo.vn/upload/files/69385771420.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/bebaluzazopasapupemufe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16142ee9324a17---45091744640.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/d95b0214694d240b3a24043e60b1a55a/jaliloxelexajifu.pdfIn PDF document text
    • http://01host.ru/userfiles/files/8898836547.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614088d44404c---kadalajeginusupiludusu.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631224450.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/13183141968.pdfIn PDF document text
    • http://qwerty.pl/_data/file/90377151929.pdfIn PDF document text
    • http://zenhowell.com/upload/file/76881342147.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/96803459230.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/fajufunod.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/siliw.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/nikowenojejogemizuvalege.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16153ce298fae6---89588520076.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/80338797137.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613138f0156a8---dizuzesudibasulij.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/batekurubi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a2c9126fe---milulegonejuvun.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/mawawib.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021920_61433_626.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_off0000b3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 10720 bytes
SHA-256: bb8dd681035ce376c29fb3841e37e6c4c323e5f18fbd55aa03a4793ff3246af1
font_02_sfnt_off0000e407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE407 14620 bytes
SHA-256: bb6efb511122dfd4a89e09662eeac7df2cdb8b7726a7bbad9c9c97c4dbb6cfef

Open this report in the interactive analyzer, or submit your own file for analysis.