Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a52b1680ccf262…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 04:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3d1792cddf7ce52dbeabce81f980437d SHA-1: d088c29ea5516e1443752788ce86e64b919ecb85 SHA-256: e4a52b1680ccf262d9953c11d20c4910a7b197de2a748c1380b1a67a22007428
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting domains. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://turar-mussin.com/userfiles/File/genujotoxajabegimexaj.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbba5a123a---76561279528.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160713cacd78b9---jitugel.pdfIn PDF document text
    • https://tangente-mag.com/img/file/kewexav.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202162153271966.pdfIn PDF document text
    • http://mhspartan79.com/clients/9/97/97d0d0788ec4d6723ba7be3cd58769e3/File/94248750146.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/77245399346.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/tupotapoxeko.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4539a587eb8536d4d7cddd96a0b93846/69183598400.pdfIn PDF document text
    • http://apple888.vn/luutru/files/xotukoz.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbcb2ce1b95b602d4c24d34e01c5ba81/4725155361.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/31487798468.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d7dc3b5d3---repedo.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/penuvomivebibafekovo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fc0dc47c---luvifodifufu.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/65698976402.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uh5grtm39tbcvg28tu0ud9fgn0/1726630705.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e51d19c44fc---xupinugazozalarigil.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/51008a7039de39cbcb9f6c0644941fe2/kobejevopinarisitugutok.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5d2c31d4b8987c3fd4616bcffc0c30f3/14017515321.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/c425a088b9a67048160167ee5a606458/62607672465.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/55218583116.pdfIn PDF document text
    • http://tlproduct.com/userfiles/file/guwizemiboregojelijunagu.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/14232338413.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/dovuzorivitalivipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=lasko+motion+heat+plus+cc23160+manualPDF 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_off0000d915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD915 18364 bytes
SHA-256: 20f553f495eb5820a735a29c6cbb4658a3b767ff3759622630685c5080b1647f
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001212e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1212E 11324 bytes
SHA-256: 4bb6622cb6b9b21ab8e650cd4bdde4177c09394ace20dc28fde53433e2a3ac65