Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d532a531444991…

MALICIOUS

PDF

101.4 KB Created: 2021-09-03 11:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5d5c7ebf9c0f3124f8cb9afa4a8e7c7b SHA-1: 5f62563c429851750df36f01f2acc972feaee664 SHA-256: 81d532a531444991dc4e564bde82cfc03c7ab58e038dbd23f27ceb9264316962
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document exhibits characteristics of a phishing or scam campaign, indicated by numerous embedded URLs pointing to potentially compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, likely to bypass security scanning. The 'SE_CALLBACK_LURE' heuristic further supports a scam pretext, possibly related to billing or refunds, to prompt user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=orthopedic+manual+therapy+an+evidence-based+approach+pdf PDF link annotation
    • https://medicentrumnz.eu/medicentrum/files/file/gerewafomixe.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/ziraruvufolidav.pdfIn PDF document text
    • http://dyccpharma.com/upload/files/wajepiroxirikawo.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/43588609572.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/rexona.pdfIn PDF document text
    • https://securitydm.com/slicice/file/28155675899.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841dabd904c---popaju.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885e4e37b2f---wazit.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/96859768949.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/lumurowolimuju.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/74979782448.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097481969930---lemelawekixiboxe.pdfIn PDF document text
    • http://novichiha.ru/pic/file/pipaweri.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b091114fc5---65246871751.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/vavug.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/84771540026.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/suc408pl0an7ulctj0kgiervla/18795942776.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609440b563435---mugutiwolepejiza.pdfIn PDF document text
    • https://miet.hu/kepek/nexef.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/de0j4bd19rn23tjm393t8l36nj/pepodamekalaro.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/8e97a7e8b49658745750fabdbef03f49/20206779017.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/kakutikonadewisisebi.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/megogisofipegevo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383C 11364 bytes
SHA-256: f5f6135867a4f35574c5e7b6cdbb41c5c419d85996bd759cde5b93734d4fa4ad
font_02_sfnt_off000152b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B3 20224 bytes
SHA-256: e4d15dbd89d0673b3180ebba1428b9e06062b72839b4332645c3fa8a140d5064

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