Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d7fd9f315d4ed3…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 20:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffe348f1bab566f2eba112969ce808e9 SHA-1: 559346d1dd7e68f37bc49329aafbcd81aa0c0e23 SHA-256: 97d7fd9f315d4ed3e5047de601b6b4db23f128f8355097d1dda4724412c108e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to lead users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160799dddd65eb---sorawaw.pdf In PDF document text
    • https://eqonetech.com/upload/userfiles/files/67066231141.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/17698897794.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e5e609894101cf89d7b780b136b6b464/gevub.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612b6de04a587---37109646496.pdfIn PDF document text
    • http://accu-chek-event.com/ckupload/files/27441607129.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/oopl91o5cmfu04rl4smghs8095/rupuve.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/29116631325.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/unu252r2s5i9iovt0igl8o4sj4/fejutus.pdfIn PDF document text
    • http://coachhouse.info/assets/file/4676433265.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/m4r4mdihkjf7r6d2sbnkehlafn/19965439055.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/34451397558.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/s11mib0ar65isg4u9o38jmd21g/96867165202.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3d6d07f8---36531988664.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/94475840394.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/259cc3bdc61d12a8fc6fff83a50faa4e/xixixidupasa.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd629130be---4017174162.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/iqi4m7eoqd41733ckms6om5kl6/xobubumovugaj.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610316290470e---tutabadem.pdfIn PDF document text
    • https://discoverthesky.it/file/kadedunaxanibap.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ce289404---22588176438.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/bixekewexemaneze.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/23quk7p7ocp3u99ambaf4ndqu2/warotuwepitanojix.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d213ff17ac1---xilawonazenuwokuxare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=spas+isidora+bjelica+pdfPDF 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_off0000cf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5D 18384 bytes
SHA-256: 1f821f9328a3109074c3ee3e9b98fddb9ae273a0f88f938cc82481ef58b35b25
font_01_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 10756 bytes
SHA-256: fc3d4c5e7860faa97e27e848c0701aa400c4736c712507518f3c604147792b28