Malicious PDF — malware analysis report

Static analysis result for SHA-256 684f7648752d985e…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 23:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7caad359adc27296379c67ab6ab7a68a SHA-1: a0affed0c151af3354e45b902d812342fdabe1d3 SHA-256: 684f7648752d985ee4452740fd172dd137daa2bb1e44be6582e58ca1692cf7e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=control+your+app+permissions
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/35895731219.pdf
    • http://dkstores.gr/userfiles/file/relixeja.pdf
    • http://shengnabei.com/uploadfile/file///2021091406300919.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/rj2ri44kb8j5ns6oo0ll7pa1qf/75669229169.pdf
    • https://ltes2.tw-goods.com/UserFiles/files/zukonenefakixoxomir.pdf
    • https://hearing-outlet.com/uploads/files/202109131408239461.pdf
    • http://ondamarinarest.com/upload/files/15945276260.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef5cdf16f5---75119549782.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161437669a5031---kotetabapedofubif.pdf
    • http://tsg-edinstvo.ru/userfiles/file/61106914228.pdf
    • http://huzatfokozo.hu/editor_up/tikanogigiditi.pdf
    • http://delfosventures.com/userfiles/files/80434453026.pdf
    • https://undergroundtakeout.com/userfiles/file/49789607117.pdf
    • http://vikingpaint.com/user_file/file/60833142104.pdf
    • http://gpszone.hu/upload/userfiles/file/11834018526.pdf
    • https://bhsbeacon.com/FCKeditor/file/garipugetesugubemebari.pdf
    • http://fotosvatba.net/userfiles/file/fedawagakanovizak.pdf
    • http://langeline.com/ckeditor/upload/files/soximumivovumapiguvorur.pdf
    • http://gzperson.com/uploadfile/files/44957626427.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3ov47pkv65ecvfup519asi2r91/5107149746.pdf
    • http://www.kevimotor-rock.hu/files/files/16847338800.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/zowoxorodeteveropeni.pdf
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/44171362199.pdf
    • http://unitez.net/images/newtech/files/munebeduwolenorexo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c11f.bin
1aa5cf140629a9da15bb6a71329933d11332ec0b0e196cc0ec1d57897eebef41
pdf-font-stream PDF embedded font (sfnt) at offset 0xC11F 10660 bytes
font_01_sfnt_off0000d994.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 16792 bytes
font_02_sfnt_off0000f1a6.bin
9acba92794d12de5b5db6b81913956abe765046882a6ee0f0e1f9b4684ed8f85
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 16356 bytes