Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa4c55a9de72887…

MALICIOUS

PDF

71.0 KB Created: 2021-08-30 04:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5497da6398e62b01fe5528a278922ff SHA-1: d02af3b887c7cbf655badb5a9a2e6d88e86d5b1a SHA-256: 8aa4c55a9de7288768456989d05f8a52f75daa80221ec8ff9b444b9c42696613
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/bd5vvf5nl13d0k25igvoulf031/falobipawine.pdf In PDF document text
    • http://pogotowienaukowe.com/Upload/file/71961145934.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/04021bbf3d7a64f1a215950fbcf940d1/gebekewamemoxav.pdfIn PDF document text
    • https://diphong.com/uploads/vupexikusalatomulanajoro.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107070512394159.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/jomer.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161264df549317---76045519078.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/xufedorawimejogam.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/83549137299.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/pakisatikotujoto.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/60072585428.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2cf037f77---6435438414.pdfIn PDF document text
    • https://adikkedua.com/contents//files/160781226.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/goduj.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/30847809777.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/bunumobogakinubisetaxu.pdfIn PDF document text
    • https://arerp.kr/data/file///29333805584.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb3d5ace5---97226365333.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/98888695746.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d60ac362a6b---baxotepitilulujarel.pdfIn PDF document text
    • http://ngonluathan.vn/images/ckeditor/files/tufuditisazuzemuk.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210718004733.pdfIn PDF document text
    • https://begili.com/uploads/image/files/43454723348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+carbon+cycle+model+worksheet+answersPDF 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_off0000b6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D2 15280 bytes
SHA-256: f046ad4c92735a3290d5bd18e67c86bdaa4963099b15f6f8f2a81427b2c69e42
font_01_sfnt_off0000dd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 10936 bytes
SHA-256: 2f7d0e40afe0f0502c7faded45976bdce6e952bd585829e895feecce88ee671c

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