Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cec8dc7768a1828…

MALICIOUS

PDF

113.8 KB Created: 2021-07-03 02:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 26a05e633e63872def13d0f036946577 SHA-1: d1488bf2db22fcc545c905b0ad06190578d99afb SHA-256: 1cec8dc7768a1828e9e7e842c95518d34f7857d345ee253ecab9f33b93eff120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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://crewmak.ru/uplcv?utm_term=vertical+mobility+definition+sociology PDF link annotation
    • http://suachuaspa.com/upload/images-content/files/bapetejidumopek.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/nupululawelarusovomilow.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/898e77bf9428b07ccb10b985c1462163/buwinavage.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b6823a074---58414105707.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9fe904e7---bufenijaferazelinufov.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/nbs8spvsqmhkvuvlrn8bdd52ip/75794223607.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1e918fb36ed1f49c15e2789d3d176659/38182858186.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6346f2aa---62992147439.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/vugkkdg0rhmsdgonkqpabkfp10/xozijuziviwotupemasa.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071846a96a8b---9487693110.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c415c659f6b---27801245261.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c967f36a2---kapuvekowasikavagugafoxe.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/eb73036d979333ae5b9218120e83fb3c/19420643389.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/8458162394.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/p46buu8feriac2ghi0um09hl96/50972036416.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/jrq31s20tneom8pdoe3dqnj0sg/12681631969.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ff54612b---xorugonujona.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f922d9db6b---lizebexowirumifaku.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/p4rq8rhmjhq1u7i1f95s5k4ds1/mojawesezupedilome.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c13c19e605a---kewabilodatijeduxedujip.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/xibosojimobijax.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/59120943815.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 17380 bytes
SHA-256: 53f76638023145e5969b22150b24ba59727d97db837f69a4478a5a8ffeb89ec3
font_01_sfnt_off000143f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F7 2976 bytes
SHA-256: 3d49a9e45c11c3827b84120034e76ff8efa1fafc8bfc4d798e6fd55d7361b50d
font_02_sfnt_off00014fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE0 21868 bytes
SHA-256: 63676e92fc839fe66ed6aa6520aab94f9e6c9baf2e84e3fe3e8250d5587f1cba
font_03_sfnt_off00018558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00019d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D6F 11040 bytes
SHA-256: 2414a8cb9346c403b353f868dd8e159671d3e5ca642b53fe2bacb467ca7bf263

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