Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ab62b498a39652…

MALICIOUS

PDF

92.5 KB Created: 2021-09-15 13:10:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7f0554c063f6b1f8b21194b3e3a096d7 SHA-1: 8014e389f07e9f771fd7ab5773b4cfbe4777d3d5 SHA-256: e2ab62b498a39652fef64e2cf7ccea8680870bce821b1bba1954b3137a94d34c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of 'utm_term' parameters in some URLs further supports the lure-based nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://crewmak.ru/uplcv?utm_term=best+emulator+for+dual+core+pc PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139f66424753---25940229604.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/79738020004.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/45008841660.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/tuwivijewire.pdfIn PDF document text
    • http://secretinvitation.net/images/files/fexepulipugulalukunikat.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xunosuxobepuwukawunovas.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/51725821771.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/nedusidedalidemimip.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/wugipixixalufedovitug.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dd26294a6---vewexaridatafama.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/794ace33d93818eb53eda3991661c506/goxipupupupafenudefokofax.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/daxurapipumevuge.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109011329494184.pdfIn PDF document text
    • http://rs-entp.com/upload/file/betix.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/30867173746.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/jupenapaxibamojasedarog.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/73875156552.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/5160710614.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/55125751928.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f054d98302---pofiwulovowiduvezaza.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/4021876643.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/ravidaseduj.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/liwofobutininax.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vusawomuxi.pdfIn PDF document text
    • http://uteambio.com/upload/files/88125909372.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 17708 bytes
SHA-256: fd3556be616942b076dbabcfd33e1be7f3092328fee7f471e2a845d3bee082f3
font_01_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFD 10740 bytes
SHA-256: a934f41d64c9418077cb6fdcf03b1100cb416395d2d52e50a78d92b0add4cb24
font_03_sfnt_off000134c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C5 18300 bytes
SHA-256: b5a9e38f8d230424db6ed89dd124203e8ffba9bcd656a4cc933933eccd8d5011

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