Malicious PDF — malware analysis report

Static analysis result for SHA-256 7053056521db4bb8…

MALICIOUS

PDF

73.1 KB Created: 2021-09-17 20:23:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 779c7c5affc495f62bf76de17188734c SHA-1: 762f78cd11e9a75dc6e53dfb96f7f88945d8fa59 SHA-256: 7053056521db4bb844ab6e96e604c41a648838ba9e1c4af5aad96e6e866c8fc6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and embedded links are indicative of a phishing or malware distribution lure.

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 http://king-ber.com/UploadFiles/file/20210912203104254.pdf In PDF document text
    • http://thailaundry.com/imgUpload/files/vipumotedadafobonobutoz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161424e2fbead2---77226408734.pdfIn PDF document text
    • https://artistaone.co/userfiles/files/33865105717.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/35210093837.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/loweno.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xogepovof.pdfIn PDF document text
    • https://people11people.com/uploads/File/81426066679.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/98167899762.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/57015307948.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/pavobizogejonaginavoz.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/82307017283.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/358376ce847f0f208a2443619d9e2b0b/73936815485.pdfIn PDF document text
    • http://babamoleskine.com/files/file/dikigesebox.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/47698159707.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/47849011557.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/5do5emjcalj2bl7ef8pl9go196/88213325998.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/bedava.pdfIn PDF document text
    • http://snft.ro/media/file/lakokazu.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/6205263274.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/29398899430.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330cfe4f31a---6733519043.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/07d5abb10148dd62abd67e014beca252/pitigujavuxemujip.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109100410481767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=juicy+stack+3d+tile+puzzlePDF 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_off0000b855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB855 17412 bytes
SHA-256: 7a10bc1d010c3feb0c8a5aeca64f6612d6f61cd76c5b8d3d03c449b3a03e8aab
font_01_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 10712 bytes
SHA-256: b34502e25eef16ca7b787363f7027d6898d4c2fa36162cd875a61a6a496b18ba
font_02_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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