Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99dbf895ce80e73…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 11:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 943ee7f0c70fb1a4e4aaaa95ac1a7006 SHA-1: baac0897873e21293869f958a66d3b2b3dd9a6a6 SHA-256: e99dbf895ce80e73ff433be5cbdde1f617336d3725f0ce5ba25ead8a778683be
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only content, and embedded clickable links. The heuristics indicate it's designed to trick users into visiting external URLs hosted on compromised CMS platforms and disposable domains. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's part of a phishing campaign aiming to deliver a second-stage payload or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://mastirz.com/userfiles/files/bemovepovisiwenegeja.pdf In PDF document text
    • http://kientrucphatloc.com/upload/files/66240536511.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/34928259318.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613487d87ff87---worivamugeji.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161540bb4c9f94---55135146513.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/75913101007.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/43999279415.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/26323093678.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/sotulopipekegavadu.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/fururiwosigozotujanoxoze.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/51621007697.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/33789831880.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135aacdb973c---jeromedupokijewadefazinuw.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/70475123203.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/gatewibigefetoveg.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/a606f56902e7a890a0ae54bcf289a8b0/xuvijifubopunaniwikip.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/04f5acc8e403858c4f4900af60e5356c/25704707324.pdfIn PDF document text
    • http://evola.it/userfiles/files/92576849769.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/wadasipo.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/jupagenetirib.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/79152132233.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/utdkuna74h4gg9ok7vbo0tm7d4/9873364620.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/38967573706.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/2959a140bd0a0157d2528bc11f80aa08/89480427440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=1+story+house+bloxburgPDF 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_off0000b2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A8 14492 bytes
SHA-256: 22047ff3cc597cf01509ebc4ab8787ed1d30ba8498ae65e6bace6c69c2cb0496
font_01_sfnt_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 10440 bytes
SHA-256: b07f79acddc76cd3a04d6c6af74ff25adb3974774fde8dfd6bd0081d6e86fb47
font_02_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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