Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ffedef9afee2d5…

MALICIOUS

PDF

93.7 KB Created: 2021-10-07 20:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: be7646549986258cd46e59bb2b635813 SHA-1: bb32576bbf8946bc2b8d2ba42e338e73092621d2 SHA-256: 78ffedef9afee2d544eef1d6da9151da0eaaeb660acd650fbb3ed1509b669f61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4477

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://laboratorioshamalab.com/userfiles/file/peref.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/dbd0a95d30f585217f75ba5a64dad45c/gowif.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/14984269252.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/tujukinikoxagawugab.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/29343460964.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/1718855072.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/sekunes.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ea7b79b2b2088cf4c0cf4a9fb40bcf8d/lutilalekorafixo.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/buxob.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/82874987284.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/43019922630.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/45354168114.pdfIn PDF document text
    • http://nprofit.hk/userfiles/muluzebez.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/batow.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/1e0f291bcb48e5e7ef394673d6b9ce89/87722074728.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/fegevipuvixumoxes.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/warevenowedivulitutawo.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/21958875547.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/wamunisamiki.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/lofenuzovagopogiwowibodo.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/nirilopoliromefominogaxu.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/68658797676.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/38146077999.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/27409146697.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a6000a3628---64513001286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=industrious+in+tagalogPDF link annotation
    • 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_off00010f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 21080 bytes
SHA-256: eeacd0811889911b750c0fe66fbbbd01cff18bc5c7c26559fe20795b08675d4a
font_02_sfnt_off00015e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E6B 10344 bytes
SHA-256: 0d78664fb7aab6ae39fcd73e86770a1ab89483cf4b34b1bca57833fc13ae8f04