Malicious PDF — malware analysis report

Static analysis result for SHA-256 272b1a9cf32befd1…

MALICIOUS

PDF

107.7 KB Created: 2021-07-13 19:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2dd198026b493e4327e5dda56524e1a0 SHA-1: 3bc807542be0d70a65cc2c5964c9915234df1444 SHA-256: 272b1a9cf32befd1a161be56832bdbc32bed0049f4b8cee0763937b54b5ee919
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them further.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://accuratesearch.com/userfiles/file/79196126561.pdf In PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/529501e8c20187ce0b2665b3a7b456a8/dabikenel.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2c1e199f1be3fb3932e26833d166cf14/71517782528.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8c62d1087---suxepewirodivumizov.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160af881e27971---17959112016.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/20495497798.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/3ae8bab547348c26ee5ce3dc0dfbdc46/kafod.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/485004644cee6fb2e0e9b5dcab7b5a1f/60832564480.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607947f0273e6---jekagerazopiroti.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/84688365645.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/e0226f6c647cacc723c4a66813aa7e5e/zagaji.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/votokajositulivuxudepof.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ll878guroruie17m8e3pqrd9f0/ximogu.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/lonujokenapikilutaralas.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/vutidevadaxezudaxamon.pdfIn PDF document text
    • http://cy2hand.com/userfiles/51916988461.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7505e43d1611979fee22ea354514887e/71215595144.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/diwivamodiribe.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/93ccd726c2d1ed51d718cd21d7ec571f/tijezunewomomeke.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/88533857587.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/53222478462.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/12132408261.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210608091142_NzgyNDYxMjI5OTI=.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/nukop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=manhood+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000f86b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF86B 18608 bytes
SHA-256: dca0891082bc089fc42f0305934925de494278f78f334793d83bbdb5f9e7588f
font_01_sfnt_off000116fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FA 29440 bytes
SHA-256: 76d5a8b1f10e4787f38e1041c18fda4e18e772a7ed593e199b550199f938e3f0
font_02_sfnt_off00015c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8A 5204 bytes
SHA-256: 87e145eb4790b33bb18ca305ff56b5687f372cfdfd64ddd84f557fb5d322cae9
font_03_sfnt_off00016f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9F 10492 bytes
SHA-256: 06e0207614b73f848c32fcca705a096535c79e9d203a337fb2cd76afbbec28bf
font_04_sfnt_off000186f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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