Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57a34af0cee3fbb…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 22:27:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b6c338b3ee64bc16002ae9ec5407eb6b SHA-1: 5ad2537eadd0b8d443e8017f761d72f1ec94df4a SHA-256: f57a34af0cee3fbb95da96a3a4fd0f50e474adae0f609ca07945e86e7836982b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://unicon-msk.ru/data/files/ginizopunulit.pdf In PDF document text
    • https://yepsell.com/userfiles/files/57271336394.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160cde18635dd1---56065032587.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/763f1301fad009c285479dd63164eb41/47243808417.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2149027ffc38b4f2592b092cb9205445/80046564313.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/67085786839.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085456512aa2---bezetajavoviwutitotawuw.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/izobikujazuj.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079be97563bc---63347127997.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b66af97e8380482bac01a788ae401487/69050955045.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/824d2236837631e84fa74f41fbe80eda/934152992.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8fd4a70c---gozejebu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ja90vusg0vqnfhklmbt0t8db9o/benagutoxiwekozazanub.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a841ab17fe4---nawexamegukiliwezeluzuxuv.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c1fce778b---80767980204.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/10b7bcb488a61db77e6cb8a5fffe3dd0/83024065725.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743c510a4b2---jilolek.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/xosamal.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bcb24e30---34539929658.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/rokovonuxe.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/05c50536f7517a432180d2f68f346972/zasumogujupi.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2dc4608c88067da728d2cbd008b7014d/51078943664.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/1dd41ba97ffdda533f27107593f5e7ef/vopetejuletamokakame.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/rurujug.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8dae20d1c5d65af12ece6b084680bdf9/79485539391.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0c4572ff---milisexunaninalepuperuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=money+supply+and+demand+curvePDF 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_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 10756 bytes
SHA-256: cd9d5cda5f0b3fa47227407539ca913ba8a8820d3032a88473a73679ed132d66
font_01_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 17544 bytes
SHA-256: fbde31343fcfdb4812612ec80e2d86b718edb58e52e72d6ae82c00bec8f0d516
font_02_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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