Malicious PDF — malware analysis report

Static analysis result for SHA-256 507a30ef71cb0292…

MALICIOUS

PDF

69.0 KB Created: 2021-09-25 17:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7d26fcf98f609c95e04afe3487ee417 SHA-1: cbc55a278841e47c5725a8ad2593853316c930f4 SHA-256: 507a30ef71cb0292977ea911a2b71b23fe096139b15230d766dde7dc56d000a9
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 appearance, and embedded clickable links. It contains numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 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://garglob.ru/uplcv?utm_term=empires+and+allies+unlimited+gold+apk PDF link annotation
    • http://studioingtassinari.eu/userfiles/files/72777670284.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/rasokikad.pdfIn PDF document text
    • http://snft.ro/media/file/vowivigekifas.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/rasanunowasuzutipujira.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2ca2fd6023637b3b0740abe551ee5782/18947616483.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/48740729140.pdfIn PDF document text
    • https://ka-base.no/images_students/files/dufafajabofi.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/53564620364.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/73917066991.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e76809a178---geganapomi.pdfIn PDF document text
    • http://maxbrio.kr/files/files/87735842172.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/kofajir.pdfIn PDF document text
    • https://rotitelor.com/contents/files/pebusemovena.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/21013327526.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/7322836071.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/19420366452.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/56679869058.pdfIn PDF document text
    • http://sjanzee.nl/file/87339250032.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/kubejipatamefudale.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/23943422939.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/42487648934.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/11420602791.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/90124949480.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6bf0ece9966bd585aa40aeb2c5015776/romalavurezajofanug.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_off0000b167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB167 14188 bytes
SHA-256: b4202a68f2b2ef97bdf115aaf983b16597efcf9115dcdc53f80d364474929c11
font_01_sfnt_off0000d4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E1 10912 bytes
SHA-256: 658c7809673f30a06bf7fc232ddbb3e77f0823da9f905f0e7b98e1a44c4b0a81
font_02_sfnt_off0000ede2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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