Malicious PDF — malware analysis report

Static analysis result for SHA-256 fedac92932cf56c1…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 05:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b297e73e10a72502448d340e17c299b SHA-1: 9f14793dea05bdabd06f07c2148e29bf86c04c01 SHA-256: fedac92932cf56c1f27ce407aaac7e6d9145179f28be2762c39029db57e1412c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests the primary goal is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=la+otra+historia+de+mexico+pdf PDF link annotation
    • http://opuspointpartners.com/ckfinder/userfiles/files/20582594963.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/lgv3h1hm0ugrgi37bn8n0us4fs/doxarosaruj.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/36702613463.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/51579150880.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/gagoxuxowaxi.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/91173219446.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/1543661815.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/naravatax.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/fawawisoxa.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/17252862944.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631805384/file/7007308385.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16141191c02d7c---figila.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/87149733634.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/pukiraxukozidopegolafobe.pdfIn PDF document text
    • https://jensbrode.de/files/file/38199923483.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6114227c---89406889042.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/47775331047.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/jewutikixugajil.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/magumulagosususo.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/5367779909.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/difaj.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/87714210222.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/58250801684.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/sawamisib.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_off0000bc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC89 16828 bytes
SHA-256: 033a9a2463c42bc555aee92ee8a89c159d39b798f8e927e58b037b9f23697993
font_01_sfnt_off0000e6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A3 10792 bytes
SHA-256: f5b3de934bd1fe696cc728654366fa9908848159b58cc45c1f3c10a5eb6a34c0
font_02_sfnt_off0000ff8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1