Malicious PDF — malware analysis report

Static analysis result for SHA-256 2908c1c3f6b62db4…

MALICIOUS

PDF

83.5 KB Created: 2021-07-07 15:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2da57cf1b133ce57041768267d987adb SHA-1: f487d4505ada3fce61ab7dd672420253fbee2ba1 SHA-256: 2908c1c3f6b62db472aeb941f7b2202801dd91464f2062a5ad98420076bcd08e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ri5qtnnahri1rmr8s647ga0jl7/winugiv.pdf In PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/rajagizufumewadatuten.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/56119193318.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e480587d9---98563942930.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b15f6d0b1125233dcf34eb6e42e0614b/23689256995.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6b0fd7ef7a3acd9ef5399a59e2354eb4/kebabosafudakeminaseva.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c49bae63df5---rufitalikumum.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b62ad29e596c8d847c76cc42ed50ed22/45725151360.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f66775f3ce72fabe08c66767a39aaa81/24593193225.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/86345h8mgk9jpsvtrdu7012aic/44426964142.pdfIn PDF document text
    • https://webmenuplus.com/images/file/94743226482.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c332c09f1e---37630086504.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d7ee4f2eac371ec163fdd1e26e46a2e8/lomumapepepujufikopip.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/2nqr1gt4hs5se80qoe3t7bu1l0/42787002322.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/36680960016.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/baf8c7e4488ab90fb2124bca0c6d6ed3/5311231525.pdfIn PDF document text
    • https://fallsplat.se/file/vanisimuvin.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e3b666b926d52bd76e783e25d4f390f8/xegapowuzim.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a481834b949---bexuluxotufefijupoboke.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/xokesebivagi.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/86128541024.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/3261895332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=comedy+in+a+sentencePDF 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_off0000e955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE955 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 10532 bytes
SHA-256: 8a9afe0b50e538a3e4b66c1c95dc9f8fa0a040d99b95603506e40677fdb22eef
font_02_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 15480 bytes
SHA-256: 1a842797dec6af0eaabfc47c0d23b8228469888e2fed2fe4c84dab4863ee797a

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