Malicious PDF — malware analysis report

Static analysis result for SHA-256 600b871c28badfe2…

MALICIOUS

PDF

100.3 KB Created: 2021-06-28 17:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e81792f69395bfd1be6945f22a39d24a SHA-1: ce0797f968937dc213285c7d70b02bf891c9e9bc SHA-256: 600b871c28badfe2d654a52d82e686b2940c31a57d9e43f78f61ab5806378d20
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host or redirect to malicious payloads. The file's structure and the nature of the embedded links suggest an attempt to lure users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/frqq1l6el09omv45b72d28ht0p/77535797837.pdf In PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/2sd61gjtpltvlq0e67hv2juvtp/dagozovuxopimewil.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/eccc0b522fb34a64167fa53906385cd9/17848738469.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/p0pi309oln88a0vjpl9htji7ri/zabonitoteke.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7993d52d4a75533af1b8500806203f27/bivopag.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-28/20210528021644318919.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a82607ce5---movurijelanilinigodi.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/97360677397.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/57380668189.pdfIn PDF document text
    • https://hgb.se/filer/file/32285358404.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///62639217030.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d226c2394c---8713569894.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16087bb8bf23f6---29816591425.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/44ddc93bfd0e33cb149aced8e9b38a59/bosejigedetufape.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/35271671102.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ddc9e6ffe---rikemelavode.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b86fcde4e---visoli.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160774d59383b9---xunaguxamez.pdfIn PDF document text
    • https://aokman-drive.com/d/files/86507689329.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa4f4b8f03---38025173618.pdfIn PDF document text
    • http://unsersohn.ch/images/file/detebuvegisudore.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/netiwavinijiluwozesapo.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/vuxovez.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/973530854.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+cost+of+digging+a+wellPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12586 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D98 17612 bytes
SHA-256: c6a4f1051342b74de0650528895779486050af6b63bab30bfe989787a81868a3
font_02_sfnt_off00016b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9D 10704 bytes
SHA-256: 4e7167dda8d5d1962373443d4e976b11e52cd48f8f8ac4578687002db4818cb0

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