Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10b494d991143b7…

MALICIOUS

PDF

119.0 KB Created: 2021-09-23 05:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 98464cd990a6bd51d92f1c60319e4d48 SHA-1: 89c34e1848dcf03f7c94e1ba34e92a463529ad77 SHA-256: d10b494d991143b73a958fcaa2a6c5b34baf4c8091f99a5a9bdea7fc474dbc7e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body was unreadable, but the presence of numerous external links suggests an attempt to redirect the user to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614927aba4866---getonoziberub.pdf In PDF document text
    • http://redactron.com/userfiles/file/dunolu.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/pikasep.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/18191204123.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902190601678.pdfIn PDF document text
    • http://esistore.be/userfiles/file/93736210635.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/xovutofojitujilude.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pegeborenufokixigazopafab.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/pcuofsitvtkfhp468e8k1438is/6773247837.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/77423571972.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/tatixajefumet.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/r1md6d2die43h4im7qfq6llum3/53744250095.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210916_160039.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/gitatuxezupilelokivixe.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbcf7b85a---toritotok.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/javotanomawejabelewid.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/rodezijiradobuk.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/wapotima.pdfIn PDF document text
    • https://yauspeshen.com/ckfinder/userfiles/files/foxokutamevefojazekov.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16307649393498.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/gakebowowononuzenuluwa.pdfIn PDF document text
    • https://timminsrenovations.ca/file/6QbFizisfdTza93G.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210903040509.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/jajabalofinoselujo.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/82102280824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=england+king+and+queen+listPDF 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_off00016c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000184ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184AC 10524 bytes
SHA-256: bf0fa7cf004e0303282c833b54f97d0c117add27abefed9e5b5ad8dd170185ea
font_02_sfnt_off00019c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C2F 19272 bytes
SHA-256: 786396bffc2b8912e5678be77933d9f9ba66aa7ac049b5831ac59fa1f8609e35

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