Malicious PDF — malware analysis report

Static analysis result for SHA-256 db08ae0d5f0d7acc…

MALICIOUS

PDF

70.8 KB Created: 2021-10-01 02:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fe9de66172d3e0aa21519c82cb5daae SHA-1: c057db78759e6cf5c01276f8aad8ea618508e3e4 SHA-256: db08ae0d5f0d7acc494f5b46c263bba1e4bc466540bd048804ea3e9d517ac3b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including links to compromised WordPress uploads and a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve to redirect users to download further malicious content, potentially exploiting the 'skyroom app download for android' search term.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=skyroom+app+download+for+android PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dl6iug1vi5bb90c802s4q3q2p7/mabuletebaseditexujugoj.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/jefukaxa.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/82036636187.pdfIn PDF document text
    • http://wawa757.com/uploads/files/70910275886.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/48451262938.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/99130177185.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/lezorotokamovufejexilew.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/kebizalivezibibikixagebu.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/81693690323.pdfIn PDF document text
    • http://canoeing.by/pics/files/rutivoxaje.pdfIn PDF document text
    • https://kawanmto.com/contents/files/42875866044.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/93862725254.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/43308918252.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/55460038624.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/lereralazitemiv.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/xulutid.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/37515614113.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/nevufujizupelisonab.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4435863530cb43e005d2d95e70dd3e13/47271686915.pdfIn PDF document text
    • http://tavio.su/files/file/lafawibalokub.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/neximabimifamadikow.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/062ef1dc3689a002fe3e1109725440e0/21905798323.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/xorakiduro.pdfIn PDF document text
    • http://btfa.tw/upload/files/xaligaludipo.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_off0000b013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB013 17032 bytes
SHA-256: 423989a1afab08e3466a4e1692db3b9fa313cc57c31a448e7548adb0ef0e2c01
font_01_sfnt_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 10628 bytes
SHA-256: b0bd34c52d5973010e06671669a8e6a2e197f7e4b6b40e992788217d110b821c

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