Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8873d9b2c32b6c…

MALICIOUS

PDF

208.1 KB Created: 2021-07-23 05:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 12afc511a973ddb226ea011de7cdf637 SHA-1: 62b857a845346c8fd38b03a59b3101dfbaee7b32 SHA-256: 1b8873d9b2c32b6ce8fdfe67e78a0b93b88c113e9b2597088efa767e3498cf42
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic indicate the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7976

Heuristics 5

  • 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.
  • 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://willmarareachamber.com/ckfinder/userfiles/files/62106392631.pdf In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f96002586---nomesedanavenoko.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/3533107478.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160810034c9254---2830174120.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210721_CFE3BA38CF2B2A89.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/96ead10dcdfceb317a0a1670680b5745/zepusagokoj.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/xegolufejivufolivekoka.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/38056271329.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/seberarowezoditaba.pdfIn PDF document text
    • https://datawire.gr/files/files/beleruzusojopu.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/59935932366.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/bda0a9bbb6851ed0cfd3f8a4b68642c6/83374513695.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/najilikeg.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8fd27efb3---gozatixuponiwududuxuzi.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/topvvse5kg072ikr7av723vd73/24256029392.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f77d6fcc05e2eacc362169f8cdc880e1/xonegewejop.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072d98f1942d---99344702624.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/12598546412.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b7c1e0c0f67f3f75f09624012f3f3919/15790075807.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/30399651812.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/92038156774.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d2b9572d7e3744d6031032237ce29899/52034449609.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/ecb643469c96fcf36eb50355be0bbc46/giduwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=types+of+augmented+reality+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002c2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C2A7 1980 bytes
SHA-256: bcf55f7f59da002c79bd97e8dcd3b6dfdc96a3f064e3800aaae5b5d197dd8c7c
font_01_sfnt_off0002cbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E3E0 11016 bytes
SHA-256: eae88adec110dad5979e127bca8f231c44a4986159af4c3bfb1e712f16665355
font_03_sfnt_off0002fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD47 20532 bytes
SHA-256: 2bb4cb74817d29ebb6892f342ae4e0163f4460c6ce40e5d13c617d85cd6ae7cc