Malicious PDF — malware analysis report

Static analysis result for SHA-256 677c1939986ee950…

MALICIOUS

PDF

81.0 KB Created: 2021-07-13 08:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b11b7f376de8584660cd60cfb9d5bab2 SHA-1: 79e9e4b5bb93e6b5f62f2cfffb4e5990e2c1671b SHA-256: 677c1939986ee9507a07c24d57c534c057a3b432195989254bfa032e514e2cdb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common technique for distributing phishing lures or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely a phishing page or a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40d4e656f---fewurafogofakuwarawu.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeb3f2ffb7---24435737151.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3da02b795---jemunuf.pdf
    • http://naturallabs.de/userfiles/file/3476272151.pdf
    • https://smartcirclegroup.com/userfiles/file/22285570506.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/uv4n9k4bv1r4sdncqep7e54a6m/jemewamet.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/50968276490.pdf
    • https://feng-shuiworld.com/userfiles/file/vetajofoweneda.pdf
    • https://miet.hu/kepek/segenamiwo.pdf
    • http://4grd.com/cmsimages/file/gefufivurelazudomopuk.pdf
    • https://luminex.pl/upload/file/deropufagipudibidebovux.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab019c12cd4---27070741218.pdf
    • http://baovephuongtroi.com/vietkiendo/upload/file/xuvufalokixewogebe.pdf
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/19561500689.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f3789dc5f566f74b9458d362edd5dfa/sozofidilotogexube.pdf
    • http://diversecityuk.com/userfiles/file/32969412581.pdf
    • https://zzhqhi.com/d/files/sunimawuwodabo.pdf
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/37bd8a1e85b4a2c0b835cfca05545d33/53128781157.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160872ac85dc99---87402153708.pdf
    • http://geredekombiservisi.com/userfiles/file/74913040615.pdf
    • https://momsgardenfoods.com/ckfinder/userfiles/files/85859713815.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9c44d833---33566241816.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/sibawepaluvada.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/7k9t6l2295s8lt6tdpncr1oo9m/gexisiw.pdf
    • http://emke.hu/uploads/ckfinder/userfiles/files/takevudaxofa.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c02ca61623498854631d0b6cbdd847eb/90943505387.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607548cc4938f---virojaxapite.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=new+general+mathematics+book+4+with+answers+pdf+download
    • 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_off0000d642.bin
f50783f668aedc5604575d9abbb99349d549f53aab37c1e3a436df0e4194bafc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD642 17400 bytes
font_01_sfnt_off00010390.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 16792 bytes
font_02_sfnt_off00011ba7.bin
24b1fe5ae48988f44a5b437bcec924805da3e00890bff3dd941c178500a694bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA7 11440 bytes