Malicious PDF — malware analysis report

Static analysis result for SHA-256 c569cd2fa307be06…

MALICIOUS

PDF

123.5 KB Created: 2021-07-08 16:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: fad1263d99d760e4014089fa71ba9a61 SHA-1: d496e94335325cd2d426eafa6714c9dacdd4c119 SHA-256: c569cd2fa307be068d00ca5b268975a061222d72ba4281761455a3f78d58ec0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607eab6029f51---93130109226.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30b63af2b---ritukoxijaxusol.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/norifugugepife.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/ppohttt3aq9qefcqb8640f6kh4/87755500496.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/walosirox.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/luvajo.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/bcbb1caa56ab06eff09b9e9dec3a6273/morelasizajowaxuridol.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12c7d281de---32925646152.pdfIn PDF document text
    • https://bloomeng.com/uploads/xukadepakonoratafix.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i45rrr5ic200precll4de61113/5806010815.pdfIn PDF document text
    • http://www.emailposte.com/pictures/69548613450.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/034bbbb553ab90c1661601617dae1e34/12191272460.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2737ae4c1---81985085209.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/12ae9497a867b53b4205ef27c4dc2637/lanixomipelawegefojed.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077515267f6c---3860541539.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29a525926c---89329079541.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ju020ron3js7pvlachgma86ogd/gapavisolijemogomiruf.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/28307573765.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced42332d3e---78219831244.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/zibonakibafufosobam.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/sapatazetiji.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/pinivuzo.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/riborobapikodavoxodenex.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/tatolikodufigo.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6a4b333388baf4472d6b9fcf9388ec2d/bemilajurarafexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=automating+with+step+7+in+stl+and+scl+pdf+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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000176de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176DE 18496 bytes
SHA-256: cd4ec36f35cfb8ad3dc92650d8f7aa228d61dc80f503d11c4fee8507aa198c5a
font_01_sfnt_off0001a793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFA0 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
font_03_sfnt_off0001c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C804 11184 bytes
SHA-256: ce567a9c780d1c8d99540e701b81bd611f038b50b4b7b4b57d251b97948fb5d8