Malicious PDF — malware analysis report

Static analysis result for SHA-256 58339dad2a2bc559…

MALICIOUS

PDF

75.9 KB Created: 2021-10-13 09:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1be94e3335e3ddb324669cafc6fd6d61 SHA-1: 48a2870061b87497c75b33929c41d0e28b6df0c1 SHA-256: 58339dad2a2bc5590bba92fbfe414b6dbb5c1594c73d0a995d821f90c6e5596f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to disposable hosting and compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=keep+in+touch PDF link annotation
    • http://opgzvh.hr/upload/file/71485517672.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/solazatowakawakasuwilu.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/54110981123.pdfIn PDF document text
    • https://bnovum.hu/downloads/velujipor.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/58f6daafbfcb50f0d6293d0108e3983d/62414527660.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/likejomutejomime.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/netose.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/rubis.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2d2d82f1076a25d3f379548852ba1b04/57678142645.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/supugo.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109190432307257.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210906_86AF9C0A30778E0E.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/40762201462.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/jelamaxufimifogota.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/82308076856.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/pegivonoxoz.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/70722952182.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109221646088615.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210926194843_854867951.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/91469954786.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/65793502477.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/82351605809.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/55083678589.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a8880a20c---73854414188.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/54375086240.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_off0000bee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE3 20320 bytes
SHA-256: 945a5fb45cffbfd2f84d67a72116196cc8d2c0e67600be0f5ac7ae0cd681e6e1
font_01_sfnt_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 10088 bytes
SHA-256: 12749358e3b073b8589ff8cf956f0dcb1e1f2ae110cdda1619adb262f1b518b1
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1