Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a8898cecf6b6dd…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 03:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6410ee21118425c1c33974dc668dc5c7 SHA-1: e287c225ff7ef5804c22b83272bf4e9e96c5a08f SHA-256: f1a8898cecf6b6dd8608bd95a5808f4f2694046931e4afbcc5858e4297c88722
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is designed to redirect users to malicious sites, likely for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://smidgel.ru/uplcv?utm_term=skybox+vr+player+android PDF link annotation
    • http://pensjonatagat.pl/userfiles/file/11441496964.pdfIn PDF document text
    • https://haruhonpo.com/upload/haruhonpo/files/22749737400.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612edf613864d---zoxab.pdfIn PDF document text
    • http://ucokampen.com/media/files/silaremesakimibab.pdfIn PDF document text
    • http://zatacorp.com/upload/files/vuzowe.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/44882983222.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/27947461847.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nibarisinixubirapixofa.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/73469209305.pdfIn PDF document text
    • https://conrays.ru/f/data/80657364492.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/e1nbb19ebs111bs0lfmni88g94/52349834629.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/lijozikipinigij.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/42527465244.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/78053375616.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/vabuseke.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/6871766dc212fde808a6e6ae20746f4c/jenezivugaxovawuf.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/85078272749.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/saxexokawomefak.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/resasojapibedenajuj.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/66068165964.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161323eb7283f7---namisinaxogonevexagef.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e7l38oh82gbrdrrqb8tqqg53h0/75644613706.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/74542075414.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/90438285686.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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10708 bytes
SHA-256: 5f3f102d80f4720889b6bbea40d834256fdb279b132a391462fb71ec1f172785
font_02_sfnt_off00010d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D19 19672 bytes
SHA-256: 9c25ee7be99beb6e33ed42df73793722f6623a91a37d2006ccb4e9ed2d03f78c

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