Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ecd07ee50ff43fe…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 19:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8d1f01f1a1f72508fb5044626f702fec SHA-1: 764b5aeacdb365db0d88f681788a7846949f0830 SHA-256: 7ecd07ee50ff43fe84241990f0fcfab8afeb4102d515de00f55ef1facaaeb977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://grubstreet.ca/ckfinder/userfiles/files/fonadonaxalusupexira.pdf In PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/37895167482.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/sobewi.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/minof.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161348a5262852---55217991999.pdfIn PDF document text
    • http://c-six.it/userfiles/files/bosuvabewuxunexufobukovut.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/46415031464.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/9468581806.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/75330737472.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/9516879527.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210914144612_279930964.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/buxanonipilizanilujajut.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/57d88095a33677e93e805438654b24e5/77576806797.pdfIn PDF document text
    • https://quangtriasianwindow.com/uploads/image/files/8931071722.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/77114792998.pdfIn PDF document text
    • http://ahknchem.com/upload/files/40356622406.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/murunapivuz.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/wamiginipubibajonali.pdfIn PDF document text
    • http://ge-mak.com/files/56109339181.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/fagisiwopinazozejezorur.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-15/images/files/81027804835.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/86833544063.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/4dd944c02197944588a9e11cb8f5b25b/54397480445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=message+stopped+working+androidPDF 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 10692 bytes
SHA-256: 80957a7e5db5eeb3889c1c5804bc38feadf81a24a479edc50a6ab637b6280632
font_01_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 18600 bytes
SHA-256: 8b0696501bceccebfc839225e65592da788fa49cf90fc08f6209ba5467c832e4
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1