Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd39aee1c31ed3a…

MALICIOUS

PDF

72.7 KB Created: 2021-09-05 12:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c91faa4228ab2fef582ed12484f993e0 SHA-1: 6c69791bbf2bb2122ce5d210db9a5b0bef331849 SHA-256: 1bd39aee1c31ed3a91d70f038ab9e560e6db98242706312c7752d9c1740b187e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it's part of a phishing or malware distribution campaign. The presence of multiple external links indicates an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=gobernanza+en+internet+pdf PDF link annotation
    • https://fleschimmo.lu/userfiles/files/71435884633.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/mezinereduvilukisugaja.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2c52f044---81359727414.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/getamodomemilefej.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/0s7lq3mjkk6u1u77slsqunds8t/relafovezobazatinesojo.pdfIn PDF document text
    • https://denimder.org/resimler/files/likipiboxipegudakek.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/64732783600.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/vamij.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/62933079128.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/89724553930.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c178034c3---sisefinuxinum.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/55036470261.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cde531b4c---44415954330.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210722082441.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d1d7b30488344611ee7f79f8def4226e/36966461493.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/waxobasobajonenu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098ef7ab3fe5---33029442877.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/799b1c5cfdec382f54b861506ac48a06/tikonevowibabarufijilewit.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/vumutotobibit.pdfIn PDF document text
    • http://ecole.ru/text/images/file/2252555881.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/29602927813.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/70015691201.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d983b19677---kumolenazo.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/vuxekuzexavofamiwujopufu.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_off0000bb69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 10516 bytes
SHA-256: 4068ba5eceededae1a657802b6b3d350e07533d8740ed31f003cc8a5d40215dd
font_02_sfnt_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 16720 bytes
SHA-256: 5b338f55cbb0ad04be0afeb89217a420ba6361045be1885f42055e071376c07d

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