Malicious PDF — malware analysis report

Static analysis result for SHA-256 995f6699f1c60f50…

MALICIOUS

PDF

79.1 KB Created: 2021-08-14 15:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da0f50e72af0dbbede86866274068406 SHA-1: ccf9a9c2416a3e37e319e9b68aa410dba9413e7a SHA-256: 995f6699f1c60f505201c08d593241487eecb4abd4b8b80771648b8a9ecf1fa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The numerous embedded URLs point to compromised websites, suggesting the document is intended to redirect users to malicious content. The presence of PDF-specific rules like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a focus on leveraging external links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://allytemp.ru/uplcv?utm_term=grade+10+science+balancing+chemical+equations+worksheet PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021062915295429.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9e9c270d---xabepazuwodazajejixa.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/d75q1j8qoeijukhk4fl88u4biebm909n/97466206895.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769b24110ca---goveli.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/suvinatizojelijukafefaw.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/91793693073.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/24087342129.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/88281842153.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/fovefezotuf.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/sewewepigozisepulonexixu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ae2e2037---31175716488.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f08eb0e399c---bomenitutabuweve.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/42428225856.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/laripinub.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a25551cfb1db2de0d8a407c1a59f05c9/91419712823.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/viwew.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d25c3ba499c364c70324eb286878d35f/mivofanesopokogodigo.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/domuzizoxavimozos.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210623084535.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05635d215a---73637277604.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/c7b9a7545b91be72a77e69a8f1c89826/62081330753.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/92101694327.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/04933083cdfb89d4cdc25f88f3baf8df/mipopejawusipujemujak.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/zivuna.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f39b163caf---64911154132.pdfIn PDF document text
    • 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_off0000cf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF79 11596 bytes
SHA-256: 3ceb8f24bb0505ba8f4967c7f068e3ce04b931831436f45b7c16e715b7810486
font_01_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 16608 bytes
SHA-256: 2d06c249754343900d4e379df90eb843ba7e6d55855be2473e9958fbd9c61592
font_02_sfnt_off0001156d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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