Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b774996ed23186…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 19:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b86e58eae7f11a9713691f6fc3e63b87 SHA-1: ce873004b91533494e02762c61cc13ab3bcf9b89 SHA-256: 70b774996ed231865bfbee14df39f0112d39e09612f148eddf2124433e364e0f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the link farm and the detection as a Trojan indicate a high likelihood of it being used to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://fuguchair.com/upfolder/e/files/20210908053433.pdf In PDF document text
    • https://thebottombillion.org/business_school/uploads/file/nuxededulosa.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/jaxozotebibikodidivoxezov.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4b535b4a---lekinatifomujerurugakuko.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/11532494024.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/veperugozaruninavipazoxel.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/digexunajubusisig.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/vebuwasikaj.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f328389db3---fupajageruxakagi.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/xekavadojerevejaba.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/88565819355.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/xorifinevop.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/mijemuge.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/kukodofufubatumikavamanis.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/dulozoja.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bc50771868a8dabef5994f37577dbb3f/maratetilejesuvep.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/99000144722.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210901072329.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613067f7266b7---54033980076.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/kagipilagogid.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/53765648204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=iphone+videos+blurry+on+androidPDF 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_off0000d7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F4 10764 bytes
SHA-256: 0bc5153972cbee96e8defa6bba9ecf73a0a897e9239253ce033b430f1dbe7b50
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 16820 bytes
SHA-256: b4a5d783c5124d7f69c8e0f831ba9995a4cd806e22f8c079f2a8092663e35816
font_02_sfnt_off00011bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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