Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a88565ab344d17…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 15:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e5c97df85f485e053f7e5fa424a5dff7 SHA-1: 86e9d871b4d2f41cf4c9f5a74a98a281996c74bc SHA-256: 38a88565ab344d17c654fa48cc0075184ddd1efec6647c5d22f72cd26b0d44e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://doreenindiatours.com/userfiles/file/pawabav.pdf In PDF document text
    • http://feach.ie/images/uploads/file/pidibu.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/74921837019.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/60f49fbbda89ac5818bc8dd43868bfab/sutijuxitevixisarus.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/66578119668.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160732ccbcb93e---xafurudebixuk.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/377597d42a341dcde93d1bc9e76a5af7/wemenawapukirekumeg.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/rukof.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/lowipulalovabagixek.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4b2af7657c4b024e1e18e722f02d3127/4856886350.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/fumamogala.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/pamiwixomi.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210731_004734.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/81468978870.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/vazulefepitalifijune.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/48323333366.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/01d559730d5f93ede118d6201ba2587e/kisuzujopuxilakiruwapute.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5f8d57391c604fecbb4c3269bc06860d/96946231210.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/56872088120.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd7a244cb7---85943586684.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/taxupepolidanajotaga.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/39022927286.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/11ba3f9b0f626cbce5d6d5328feabb82/kiwojivimejigip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=action+plan+example+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 10596 bytes
SHA-256: d4475f97186feaf7982b076c9905c64e044919756f926b833d49de2da3f5c1c4
font_01_sfnt_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 15740 bytes
SHA-256: 907292042c99492405cc977352458f54aa2858bc376eac9d14b6860c2eb72b5a
font_02_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 17896 bytes
SHA-256: 178a5c4f086b125f325d1e8237c26d14cab34bb4bd0220d65151e120779aa40f

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