Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfaab510a45875bd…

MALICIOUS

PDF

83.1 KB Created: 2021-06-26 00:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 64478cc5924a791b38499d4a977239de SHA-1: b6e4785532ca188f3335ff13e05973fad4b00ab7 SHA-256: bfaab510a45875bdae4c78d4948b1bb1770072cc754025a7eb213686adac40a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other domains, suggesting it's designed to lure users to malicious sites. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://laclonghotel.vn/upload/files/sixorilizexakuzisugofo.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea2d8a7d05---gizuxudalezazoz.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c6aa8b06---gojedogu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d376fd3fbe---13549770541.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160be5c0cd23db---busosolasasajemameton.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/ledajesu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f3e2eccd1ee616f0a15c7cb94bfd45d/66475040134.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/mopuj.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/70c33f2cbe3da2e181490574210eacba/vukuzikiletiseluwakikive.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/vedbqgjiacboivsu6bjleig6gp/gabagasazazezexafofom.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/80f4e9760b39234a9ae805a8468cd715/pixakokixadowuvunamuvom.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a3vul93dnv2ucortnq9t86oqu7/siporebiwewujege.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/49804038700.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/tusedaj.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607066766229d---27504673220.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a17d73c04d4---filirajonugisenuris.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/76ebebfdd313b799e4970be7e0ceb8b5/zolawedevala.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/14e67a033e78a07c8d1fb98a30e60c2f/pogukagavubojibonem.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/tufubozatuvetavu.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/931200cf5aa03ad78ada4a5a80853c0f/18639873373.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/zawomuwarobodupomez.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae424f79352---14629703147.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc51e6657---59629734912.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/87288254243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=michigan+license+plate+tabsPDF 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_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 10564 bytes
SHA-256: 1c73504c39336e837aa1fb814d25c90e0c0c1d5197125d6e1e54efea0e8511e2
font_02_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 17196 bytes
SHA-256: 645efa5f4a6fcdc14add035d946ec703336efac6a91d180bac6333461171c1fe

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