Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57eafa571a15627…

MALICIOUS

PDF

90.1 KB Created: 2021-07-23 08:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bf201d371634ba0232dc4e01e745534 SHA-1: 5e06028f28f33f523b2aa5bdb212ba3d4b5f82cc SHA-256: f57eafa571a15627b0746d43653d0b2657ac588da89ce95541a4f863ea9862f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of a link farm on disposable hosting further supports this, as it's a common tactic to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://indecomavo.pl/inc/91283277330.pdf In PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/7052326931.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607138b0e35c7---xoxijixukabezejafolimu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/s6viag2tqh77nhq212sodthak0/90743464850.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/93726129551.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5da015741---53811945152.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/34250714049.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084dbdc34cdd---61811687402.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4c140418---18580540568.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/23351840168.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/74929521031.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e97a50364---guwetunusagebilisabe.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kojidukuzi.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/lefapexoke.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/nuwalejes.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/roweweropamagasuduruxewe.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/jibelunenagofevo.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d5ef3a74---bopunafarodotetu.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/kulixufuvomadiduguwuve.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/deralabom.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16077356da0827---nifapixakiwavasexiwogikat.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b49b42f1b---5524049134.pdfIn PDF document text
    • http://mp-journal.com/media/file/kudobesasi.pdfIn PDF document text
    • http://www.heksan.com.pl/file/21438287916.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/13525823114.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897f318f169---nosiwaxunajepugotukabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=three+houses+student+questionsPDF 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_off0000ff5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5F 16492 bytes
SHA-256: 0180904c1bf036e19cc309c3001344bda7591f3541b985ac30925c0b0087d73e
font_01_sfnt_off00012a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A34 10348 bytes
SHA-256: 002fe862de824603e8a2d7137eff048d72f7e621e59700d4ff95803ad6ee32a5
font_02_sfnt_off0001414c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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