Malicious PDF — malware analysis report

Static analysis result for SHA-256 6885a25c0da815d1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 11:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97d3b88f24117d09ac5e68dafc0747dc SHA-1: 5b8610396c013f67166332ff796d174c4e3d06d1 SHA-256: 6885a25c0da815d18b9a1dc99aff8e6da00ace02b908988f9a09c155c334f9a9
164 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised CMS upload directories. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malware. The ClamAV detection further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9441c104824268ad2f31a6c0e3bcd8e0/95662604100.pdf In PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/xiduwipaneleloxofusuke.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210907091554.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/sozuluturisonamebiduzep.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/31362933520.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/majagiresazigepimuduw.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/lofijujafodukitomebilo.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/zerukusagalajogalalade.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/tabulawoxu.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/ledidisorasepaxigegiv.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ded3392174---95928464506.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/89680683951.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/motubuwigaxoxiwi.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/goxokegodiwati.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/64450880183.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/xigovoxojasowibowuvebez.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/81622671073.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/77138118299.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613556d82824a---sipizegumuxu.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/78262165383.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/38345883858.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/97838360720.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/94148511926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=future+crime+simulatorPDF 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_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 17748 bytes
SHA-256: f21a37dad69cb7f0e3243580d9d74c8e3279579f259bd1f9ed553c64c5e9a397
font_01_sfnt_off000107a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A0 10364 bytes
SHA-256: bdceff1d461104b8762e7c49b377698e0828cc2d8ec19616821d683591c5bff9
font_02_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1