Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd2354965b28ed7…

MALICIOUS

PDF

91.8 KB Created: 2021-07-24 23:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2c8929fe4df36061dc650128f4cc216 SHA-1: be7c0b22e15d52afc849fd42181724e58be0df95 SHA-256: 4dd2354965b28ed79496ed173c1e1e940eff5b44109589fad6ebc0303d7f92b7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://zebcom.in/userfiles/file/piferurazewidotuxelobe.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/ba784f40a0c811eb22535d70938c3d62/70188814804.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/49031168131.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd6ac4328d---75121647776.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa8e3ce8e---23409450205.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/dolapitujilo.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/voxodobeminilugenik.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4ce7872fa---34338847240.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/depaxadoxanu.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/61031717112.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/pnukovprsrh1235t9al4cmt711/jarowubepisolagido.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/17efbe1caa14b012274d57a5800f2d93/99751558783.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d3bc31d04---80556602522.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/vubiridil.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ims0j816u37hvmnva48tkn3va2/tafavijobotadazujatupu.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0430d3c017f2c2d79273be207824e63c/bonikelalubatevobulokatep.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097693f809ea---11381356019.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/09dd91a395dda18a97129c4b7a7c9ac4/17456879790.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/b7a08257388efa0df22ae58189795355/pufederirumuzukozijemet.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3f8f0dced3178e23914c2ef8a841eb05/60390882893.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/heqgbo0ju620bkvj6hpr34gp2r/92234563066.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/18378329984.pdfIn PDF document text
    • http://babamoleskine.com/files/file/81605223220.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/kosibovesom.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b69596552d---2652294831.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084de579025b---rifipibiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=everything+i+never+told+you+pdf+full+bookPDF 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_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16700 bytes
SHA-256: 21a22b531b7cf210f786dd516929d0a40dd7dfb121a09df56dbb8579305cbd2e
font_01_sfnt_off00012e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E66 10944 bytes
SHA-256: d33057f049dee646cbe8b3092d3a4e5b6ec48160e88bafe66139cd151e6b6eae
font_02_sfnt_off00014739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1