Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6af866c7375acd5…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 00:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1711fddc3a4120f6498a1f077c5c5270 SHA-1: 1c7f0dd196791b35f2b81bd6af940691038495fe SHA-256: f6af866c7375acd56c5a495beb643d099d4a9e07b350a62744a890c42f4f60ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised domains or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://granitabrasive.hu/editor_up/24393956720.pdf In PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/jelisa.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/jegad.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613fd2580123d.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/17073091927.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/56694794104.pdfIn PDF document text
    • https://huanghecables.com/d/files/timifevubejajojo.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/55963284207.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/75344740301.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8f2226a579f5445f902baf6800f5863e/kunebizewatip.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/2202093090.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/9f2b997ef4ac083345d6b374867b54f1/satewanixapanidiris.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/8327002586.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/faaab99e72973c91864700d14c692434/1706118708.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/7946731058.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/57584837871.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/84673649583.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ca8891490e0d6bfe154449ee39479da0/99596745068.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/tonewuleba.pdfIn PDF document text
    • https://kaimano.it/file/zexulasozawadino.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/kipujalif.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/56860844163.pdfIn PDF document text
    • http://med-os.com/user_upload/file/rurinajofozila.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/xutasomowowu.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/wotasuturomixipi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613c329c2ac3b---13773690877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dark+mode+theme+for+androidPDF 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_off0000b5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A9 15428 bytes
SHA-256: 8ae8855fb1b1fceb6f02784298c7d042adb4de29fc693e5a1c3527694197ffb6
font_01_sfnt_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10496 bytes
SHA-256: 70863a1a1a6e6babb5c8846662a8d5934ae75967fe5979af9d0a0bd751a52526