Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b2096f542cc89c…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 23:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bae100356263acea0fd4d30a17adf77 SHA-1: d84717951f1984f332886d5ced944d3c94597203 SHA-256: 73b2096f542cc89c25ffccb2385135488302802e42826e83bef8d23caec269db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=download+king+of+fighters+apk PDF link annotation
    • http://konberdbio.com/upload/files/7256064502.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/wiluxisimarozitamidesofe.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/64987746815.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/kubigari.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/gubegeniwat.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/68872978873.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e98228907ffef2435b9509cf1efcceb9/45284858368.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613194ebdbda6---jipogigawamebidel.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/xofudonevemozagegid.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/20862348692.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/bajatewuf.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ggbbovq4v5do912p6013um6jia/zademufos.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210922022518.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331fd6adcf7---wuxawatevopafapikekijaz.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210910065455.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/mekeginazivewu.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/51106309339.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/44282574453.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/15140243378.pdfIn PDF document text
    • http://dalaichau.com/files/24099084983.pdfIn PDF document text
    • http://pk.mo/userfiles/file/29500704889.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_off0000abf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF8 10956 bytes
SHA-256: 6cb75c2fad75e9216a7b76c346f635af78bbabcef17252299e0815dbdff41da9
font_01_sfnt_off0000c528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC528 14444 bytes
SHA-256: ded857cc6cf321e003b744bd79c878a463566e1c91cb0b7e2a7ac3f4dd2be6e7
font_02_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1