Malicious PDF — malware analysis report

Static analysis result for SHA-256 189b85da29367ac1…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 23:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0459cc185d4b6bd6b00a9485c5d14da7 SHA-1: 2de87f3fa8a49fcc36f312778d2c8d2b7ac7a79b SHA-256: 189b85da29367ac174c5f8cd8da4f65c72276d062e3aac00619c2a000f1601b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with exploitation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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://myphi.biz/nbloom/fckuploads/file/19356481504.pdf In PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613558c15d772---detukoneta.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/saneluvifedibisovuvi.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/boxadej.pdfIn PDF document text
    • http://nenorm.com/files/files/welaneretimupulaj.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/sajejelokapu.pdfIn PDF document text
    • https://baongochoa.com/upload/file/nebavi.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/setenorimogukosepol.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6747ada9---sixutigufufolaw.pdfIn PDF document text
    • http://precisao.org/files/files/nojesozuzikoxejapunotomu.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/pakopozadosojarakuwopuper.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea324c426---sefufijapivenutebosobugu.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/xawifotoreg.pdfIn PDF document text
    • https://baptistfriends.org/media/45573099981.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/47427465750.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c18c6149---18151099180.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/faxamukalidawikase.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137db076249a---podaparalipezodatiluzera.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2c220bbc---64291160455.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xasaligafuwukaxifuteloz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161379c6338933---68526878269.pdfIn PDF document text
    • http://fnathservices.com/upload/file/60160161038.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/66308970728.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/linudefux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=imo+video+call+for+pcPDF 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_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 16624 bytes
SHA-256: 2bcf4ffc644ba6022e147894b3bf8ea8b0d171fb9093a2d17cbfcfd37c65a512
font_01_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 10428 bytes
SHA-256: b69cecda2714a5fa6a12b2c0d2fd491d61374b447c53bbfb679dee60b1ac5d4a
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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