Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f4c2615b278c35…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 06:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 77f74d45692054672d7664198ac94a2b SHA-1: 9cef7919201591739db36763dcc53dcfc0a54919 SHA-256: 50f4c2615b278c3571cc743e54df301a00d50eba6299cdb48262f1c038197f09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with common techniques for redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://queure.ru/uplcv?utm_term=legend+of+speed+hack PDF link annotation
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/aea78518524c897cb7ad402a9e053877/32915521834.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/lobizivudibewabezunuj.pdfIn PDF document text
    • http://wamer.org/userfiles/file/bikivepimupidebejugi.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/fobelokona.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/50204298992.pdfIn PDF document text
    • https://softnettechno.com/sribati/editor/uploadfiles/gitulerumagibiju.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/27266884001.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/68108374259.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/22138564284.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/zenifelilagodadidazub.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210913032016.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/badilinirit.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/tapete.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/fodurojusazir.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/juxarefokovek.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/51241250552.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/69379138802.pdfIn PDF document text
    • https://tekartltd.com/upload/files/dawimafuz.pdfIn PDF document text
    • http://pjteam.hu/uploads/dezafiwiferidix.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f175a1c4b3---miritewefedulefowifizo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153eba12a627---99729224976.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f30de245ef9307231054ec4ce66eeb9c/49879891568.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_off0000b1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CF 10612 bytes
SHA-256: 7cffca12f70bd96eef07e756a86771a37e2d0f3705f22580253230a82459d916
font_01_sfnt_off0000c9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CB 15700 bytes
SHA-256: aaab936e3b06cd09695592a1b8c205eaa58bb078214df8c2cbfbc61b0397b0f6
font_02_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1