Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e627da2e584545f…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 13:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 60869e43d49f730a15a0817b9e07b2b3 SHA-1: 3464df68e5a4575657dfbc2d3b26bed0906f4e94 SHA-256: 6e627da2e584545f12c7346be95dda307e113b554949bd12131301efcd72fe93
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that likely lead to further malicious content or phishing sites. The presence of multiple links pointing to compromised CMS upload directories suggests an attempt to host malicious files on legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d14a8287e---dusubube.pdf In PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/63329096450.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/17650839396.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/gapagotejapoxenedan.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/25811511227.pdfIn PDF document text
    • https://petala.gr/userfiles/file/kagisipugonetoku.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9553cfa4d---murukojesabejulalikenab.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613838b40406a---viloru.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/zotinukile.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210908_7B749EEDF28C7E18.pdfIn PDF document text
    • http://feg.vn/uploads/files/xalurolulo.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/16976486621.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/zuvifilubejosijedo.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/25559153358.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/48020422735.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/44298779349.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/fosamo.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/92691325095.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/tubiwoselebulosuxaferase.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/10725253809.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/pomubadiwigigejugeratosu.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/11836058750.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/tupulofa.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/64462155868.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+guide+to+redstone+pdf+free+downloadPDF 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_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 10972 bytes
SHA-256: 0db7b7376ac8bd44ed060f53782e2e880c18194308c8f5c7f0d30f4c29a798b6
font_01_sfnt_off0000e331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE331 17532 bytes
SHA-256: 1b3c68f383e236ac5a5814006a36001ba463bda0c96074943ff5a815b8075f0f
font_02_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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