Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6cf12d8221d055…

MALICIOUS

PDF

72.5 KB Created: 2021-07-06 16:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cee076827d6429ffb73f8538e916ad57 SHA-1: 3349e1b13394cfeca78a630535c4a058d113c931 SHA-256: ec6cf12d8221d05560920471684bac1a1db59ed24913f113c569d94335e36f07
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the final destination and potentially track user engagement with the phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bumsnab.ru/uploads/files/57522662308.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/a89ec2c33f676e5b28488fa945cc9763/xenaxunazisadun.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b72dbceed46---79393328684.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1d045eb2a---56912380600.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/62404727457.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/nijidub.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/7a023a926e3e038c4413548e18aa5c7b/vojefefasixirajokejizilur.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e41c41f52f0ec1fa3a797194cba1feb2/zivelozedugumezuzugido.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b462aa01ada910b84698dfac407b486b/konufamanona.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a13f4858a7657b819c164783ef10cc45/joxabona.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/29173754732.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0ca448187c57d3f63faa17285777033b/pujofotulubogajotilemipar.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xamuboziliz.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/c3fe105feea252e4fc05e2165937e5ef/75273689298.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/32339960774.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/m65mgt0ob3mnbvtk3vmmbs7s46/furumudivevexelavafale.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/gaxarewunasesarilotedug.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/02e4d97736c24463ec7f808ea9cc9457/zajiroruro.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/26277959647.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/pedijalavowa.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/pagapimidabotib.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/busirorofuvixe.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/56074953720.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/xilaruvezumixuxig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=export+jquery+datatables+data+to+excel+csv+pdf+using+php+ajaxPDF 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_off0000b7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 11680 bytes
SHA-256: 3babfd9f1b833bc775ea9036eb6726fedf6682a2aa4f1285a827bc3d7430acc8
font_02_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 16124 bytes
SHA-256: 91ea3d688ff7fd8e6b555f9f5f392e509f3a39b73ddf2648a769258ac9af698d

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