Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c5dc2d7c587a59…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 06:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e7eb76c2b1fe305524ebcc89c48fd433 SHA-1: 9c5dee33cef12269148edb15a91ea17e38628f0e SHA-256: 83c5dc2d7c587a59d2996dcca106d3c7b3e701a556ef4005067ab223d2942361
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised websites, indicating a phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to download further malware or engage in phishing activities. The presence of multiple external URIs and link farms points towards a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9497

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://oniceh.ru/uplcv?utm_term=wof+book+15+cover PDF link annotation
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160d25340cc3dd---vibatenejomedusegabam.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6193a31b8f7e2196c08ecabb52241e62/sigawomezivemume.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/64689926650.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf9faf4fc---69282379897.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac81bb219---7571636417.pdfIn PDF document text
    • https://aspirans.com/files/file/95424708000.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c029c7c614---piravanupaxerogiwaguna.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/42181769815.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6e56ea3a7c56d63d260758f3dcf33d7f/xavarulesunijezogo.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/51747082cb14ae859007c07a42e76406/koredosuwozisigekivuvunem.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96eda4334---xixujenuj.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/funikuzamiwaxusefa.pdfIn PDF document text
    • http://kadernictvo-svetlana.sk/editor_uploads/system/files/vixuvigipox.pdfIn PDF document text
    • https://arerp.kr/data/file///3032618701.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pjdb9n6kqetia5aj0t9qdcg3ql/sibijufuma.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bad5e278c---gufesujedege.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b36840ad6aa---jifezawuw.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/zufana.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/le5en07llc0hsheo221kr0gln2/viruwosofumamazogezo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0632775dc2---63471893553.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/89801727544.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/6667010842.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/476319ddb5cb1bd7ca86f9cffc64c562/94110433297.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/2126076541.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711641a4ed5---wegiki.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/3472719540.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 17452 bytes
SHA-256: a8335aa2f32819bce76d73411ca3989ad9e385144cd0ba50f66f83279c017755
font_01_sfnt_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 10136 bytes
SHA-256: 8abbc827d0ee7f1edd3c8297e95237920b56078c86ddf8c10fbb71b6d4082ebc
font_02_sfnt_off00012433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12433 16220 bytes
SHA-256: 644c4cf2cdbc6b6c47c7bf521fac7744a686efe78999c5029991aeeb6944595e
font_03_sfnt_off000139f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1