Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c40fb3b63e0246d…

MALICIOUS

PDF

90.9 KB Created: 2021-08-07 03:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 2f6018a1090b2157ea87e1cf48c8e54f SHA-1: 8de7e2f9c0d80b9c4524334fa77777039120e11c SHA-256: 5c40fb3b63e0246dde923dffccf0176df2d628534623170d740bf937c73838a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress sites and other potentially malicious domains. The embedded URLs suggest an attempt to redirect users to external resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/cc5758757408c0544299d27f5d52bf5b/66766691185.pdf In PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/6a59857a66d0b25018870f0e6d5845b1/39538535894.pdfIn PDF document text
    • http://mamam.by/upload/File/file/jiroporovibapoza.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/sisowumenozod.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/5496684415.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/ruzamurezusunazepido.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160f355ed8a247---xejapazigegemezefefifexul.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ac943fd3424---labokimemalagedowukoxufit.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1610c266865aaf---xofototuniwapemur.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/lewevatimeji.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/94404237.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/sadatepevupoduwonopem.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/f3bh2202a70stkk63m04fbvlf8/28389923113.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/fixetiluxujedasaroxagune.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/cae0becf311e7d748597a95451b0e433/91782161504.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160966ed98100e---kamero.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/43183824669.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/sorokemiwupora.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba787f3511---xizedaweteju.pdfIn PDF document text
    • http://tyextractor.com/d/files/zufelufopifetogaba.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/49046729631.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c006bfd6e09---47770913534.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/nqeudm8ff369rucjssqt1k0l0u/43409902707.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb0a60d1d4---widemoluvopagujimopobera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=associate+resources+limited+brands+aces+etm+schedulingPDF 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_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 18192 bytes
SHA-256: f858c9d615c7ac5984f17c6fac795f7fa0558976c7b019e60693dea22f97e195
font_01_sfnt_off00012bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001440c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440C 11036 bytes
SHA-256: 1743905054a87ff6a613760c89ab1d22058436f06d73563bab5f2f6233c5aceb