Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9c056683a083f0…

MALICIOUS

PDF

80.0 KB Created: 2021-07-23 13:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 31db2df4607deb1327ad62a90c3bd774 SHA-1: e7efb72d59a405bdf4e5d7094363d558badc8941 SHA-256: 9d9c056683a083f0de5eca36e9b3450e5384860969feef900e548d0e16dd1e63
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160adceb7d53ac---41304415234.pdf In PDF document text
    • http://beateromer.com/bilder/file/dopeva.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/mgomjvvtevt58chp8qrkh04jme/71007534558.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/k4ssos32iqsf1tbkrdgeqg8qg6/97008452151.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/zaneb.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/16e237e28756c8b71399b891bbe4e090/95796965968.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/rodogaduxinudirevegesux.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/liwojovu.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/sevakakuvata.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc51f3833---jotadokobu.pdfIn PDF document text
    • http://billcolletterealtor.com/clients/e/ef/efe7172bdc9c6addedf700543cb5cb37/File/76605838386.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/16887353864.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/birojus.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/954b4267fa7f5c6d5bea9512772aecc7/jinitimuxeruwene.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803e888e88b---55536266295.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/hp7humabf1kg4s1tie2e70h6a7/sogebutobokewufo.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/93411355135.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/gamesowoxewa.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ec91ac10fbf2c4701e9778afefbef9bc/24777331031.pdfIn PDF document text
    • http://ippon.lv/uploads/File/88462777127.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/sezitedinivarijokugezexix.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7a2e09172863aa153f7988fa0fedcfb6/wipuxixin.pdfIn PDF document text
    • http://parentini.it/userfiles/files/zoronaruzusuxok.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b807f63cdcddc54903052332fda6bc4c/gupareduxili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=toolbox+safety+meeting+formsPDF 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_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 16700 bytes
SHA-256: 506576e437b8c55f585c0f1853ba0d7ee0ce7e1b6c2075de7a9a43be66340894
font_01_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11849 10876 bytes
SHA-256: 087cab287df246ccf10e436e0f62adbac0bc3bf7c78aa1fe7b98051a0a988eb4