Malicious PDF — malware analysis report

Static analysis result for SHA-256 88985cc879ae5da3…

MALICIOUS

PDF

78.5 KB Created: 2021-10-05 12:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 93aee242f19d43d1b108487c214cd1c3 SHA-1: 134a20373242a97523de97a30e0d04a2c8598d84 SHA-256: 88985cc879ae5da3d7be4943a5c1d3831c7f80c5503b0579c1fe2cf628a9620f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.physedu.in/newsite/userfiles/files/dovubut.pdf In PDF document text
    • https://learn-atdi.com/uploads/files/xaxebixi.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/gabagolasunal.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/74765817777.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/19372131720.pdfIn PDF document text
    • http://goldmustang.com/files/files/gamiwifovugufifobijevi.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/41822155688.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/jenusitos.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/86988352089.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-16/20210916185546954186.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/14619085475.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615726fba049e---wikasogigerelave.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/85875470800.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/44983466704.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/85485957661.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/wezaliwuvumaximexazozozu.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/jivuzanolukuwaxaritin.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/13930660440.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/ravolovowagifasase.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/80003719474.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/donawe.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/rifuzebususos.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142609272e7d---zuwunaxuluxumixijerojoje.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6cd031052---43829528684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=time+change+datePDF 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_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 10344 bytes
SHA-256: 729324dfa721a708330d82069e36b951497f0f809f09040ad5cf6a26b36257cd
font_01_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 20016 bytes
SHA-256: 25574b0119ab4a19b18105502f741826e6f8f59744e8ebdf05a7d879a61e6296