Malicious PDF — malware analysis report

Static analysis result for SHA-256 4068355575b0bfbe…

MALICIOUS

PDF

87.9 KB Created: 2021-07-15 18:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c01abc909b2f18d878a405ca7aef34f7 SHA-1: 1ecb8b7e7bc5d5a541416ecaf5d948308fe5944a SHA-256: 4068355575b0bfbe0c27ce137d7526157f97830b455af2103e6822ff350cafbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://daquin-ferriere.fr/userfiles/file/4105655375.pdf In PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f698580d---lixalavefapob.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/60433322709.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d48054a70b3c1685187ac3e40678cb3e/varoxadoj.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb510daf4d---20740676584.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210628032228087.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ip4qole8dcounc4904qfcuel0q/lituxajebidizevudowoku.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a20c62d8da5---wadidoz.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160984a23c140c---nonosawoxuveb.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/efef496dbeb5051c6488cd71bb219701/mozaxujigujosazamub.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/alavoa96h5un5d3p8dbekaavb4/85924564997.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/20f9c0109250799536a5ab186b17f72d/xuluxela.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a650adf045c---47046272634.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160725b1ce2266---73689882076.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/24832717396.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/q8jroj6eaa9idm241955iohsn1/kutekewu.pdfIn PDF document text
    • http://erdbau-rauch.at/86104116720.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/k4uo9d97fb8i8ima5evj6j0e6j/89032271894.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///runisugozapotexexo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/39528369551.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/54660883632.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/mobupafomuzelinewuxe.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/75173103135.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8a69ede8bae00b9786b0a89de2042462/72677463376.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/sapekijimopojalejodifuwig.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e36193d8---ruriwigi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=metathesis+reactions+and+net+ionic+equationsPDF 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_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 18764 bytes
SHA-256: 81d23b3ee08a69a72ed77fbba94787d6d81de8ca36e872d92cf6af1978d7d741
font_02_sfnt_off000139ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AD 10660 bytes
SHA-256: 839f12c93e10376d44a9c23c4cb80a2659261178d1fe8e1e6adc4731eea88418

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