Malicious PDF — malware analysis report

Static analysis result for SHA-256 54de3de4c7d4f60f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-03 08:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5c80738191b058db5fb729c2ce2d93b SHA-1: 80cf38cd0c25e41e7536453927aca41f85713ec6 SHA-256: 54de3de4c7d4f60f9399ea3014990ee88e4277239a4d1d7fe2ca6b9ab938606e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve to obscure the true destination and potentially lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/1f03dbf7cfbaca561579949d6298d4e8/51843937078.pdf In PDF document text
    • https://artlabjo.com/userfiles/file/70935189216.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/81120713734.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622295699.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607636d48e125---luwegujus.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608872ff92bd9---zukujanujimixozasixinol.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/50a175afcb5c02eb642d2185cd16efb3/32380112695.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/vekulurujowa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/15595078262.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///zozogebanarov.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d59c508255dc3885628dbe506107fce7/33834948048.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202108241951564813.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f0d704f31---zifesaribilofapinorij.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/metigulon.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/pizulosejalemagowaxonupi.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/relaleno.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/39286223979.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j2ue2dj956po52l81qp3bq08c1/ganirawaxopurunokun.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a293a0df78---fopoxiruluboxatapijek.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/67c33d58c2a1077c840fb59756d697f7/88893045409.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/52533932535.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/dibedolatefogaxikebi.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/gcu8csc6eb71t5f3finejh0ge0/xedefipujuzoregozoj.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/62862139462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=comics+garfield+espa%C3%B1ol+pdfPDF 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_off0000c641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE58 10996 bytes
SHA-256: d9c49b189fff5107bc1bf524f2c37b05a8349ae98ad43d4150f5a1fb3308b186
font_02_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 18812 bytes
SHA-256: 6ab09fa32960b9bce031511d16dacd0b289eda01616a921a38331a41a288375f