Malicious PDF — malware analysis report

Static analysis result for SHA-256 9182c3f69d201328…

MALICIOUS

PDF

87.4 KB Created: 2021-09-01 07:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a154545e0e60e689848e8c680536d18e SHA-1: df26ede003bbb2016c50ad03d2ef6c29e9af2a5a SHA-256: 9182c3f69d201328a399bc5eba06cd5d33a7d69f24a7a921d73165466e6b9e19
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b648aecfa---rarutarifevijivopemaxote.pdf In PDF document text
    • http://shopphutungmayphat.com/upload/img/files/bizoredotivibazuwo.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/buue6ap45jha65to1va7hus8gp/perifetonetotagifodo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9fd34f5d4fe94703ebc1ea2ed6f709fc/82816908592.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/liren.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/tedunuzesepifagenasa.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c974867b24---94174594489.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4333acc1---sovora.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/zapavakeramaxenexegogiz.pdfIn PDF document text
    • https://estoniapools.com/contents/files/rexisubipufem.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/7633193366.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/11678969265.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bugivolapagujusu.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/nejudagilogatopazeva.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/52805563019.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c66b8f7f9---fexomanuvometexorinivu.pdfIn PDF document text
    • http://edallyshop.com/upload/files/79736134759.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/6143811577.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/sifoxaxedaleduwe.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608866e825203---17338686704.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/serujupukoses.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/44785267717.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf989aa4fb5---43544279506.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/wijoxejusotufepedijum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=from+maya+to+substance+painterPDF 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_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 10820 bytes
SHA-256: ceb6b0b1be6849704a674d517cdc63a2439d7e949ca4bdb783fb7ce6390e6532
font_01_sfnt_off000109dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 17940 bytes
SHA-256: d612d5e7b9290eb9ee87b0a3cffde75d6bb4c920956b42568246eb75b614c1af

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