Malicious PDF — malware analysis report

Static analysis result for SHA-256 86cc94956bb32f5b…

MALICIOUS

PDF

82.0 KB Created: 2021-08-30 18:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f682ef6be383f09c5cf4c69601650822 SHA-1: 64fa77c44da0f2d04f60fd5403d6c7fb36a98a2a SHA-256: 86cc94956bb32f5be28ead189beaf87501c413bdbe82b34065cc127584e13cc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b3ef24a412d01ff543a410c55d77bba0/konabu.pdf In PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/sodunaxusikomolefifidabi.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f227dbb8a---53513784489.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/4u2t86u1cstj3bf56454k4qbu1/68619979180.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/xominibinagosipokodew.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/44285921017.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/guseliwu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/6f11fbd98bda779d761a814e87f6d54a/bonodosiluxokuxowasili.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/76d55be3f831b228ef02a1d2f3c6b573/disarotixajalajewiropeko.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/43579584322.pdfIn PDF document text
    • https://bonacorsi.it/file/faxikuvapigerovuzopatoxiz.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/48853508686.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/75742227559.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/d4a3f19c6b602a8d5455a437f806baa2/8771780656.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/4107290079.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/6730634938.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/dekovurawoma.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/bevibitarazozefa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9506c7a6bf---fokutuginenusabu.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/boluzulabijir.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/49172931646.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/lidujobarager.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/37950883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+bee+bl2PDF 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_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 17576 bytes
SHA-256: ac460cf3ba32e1445d97a812dcf10502b359e95e4657643542d2c356f28796e8
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 9584 bytes
SHA-256: 1c073726e64c368ad20a98f74186ac06aea3bc0b41ab9e8ba5d169899515bfac