Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b57343b91e87f42…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 08:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e339b9f5f560023da96f30954bcd85d8 SHA-1: c5a5c08bc4eba0c749148d8cca71ad2df49a936c SHA-256: 9b57343b91e87f42958fd570276f89d89005a2e74fb106ffbd94733eaa823525
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://centroolosprato.it/userfiles/files/sizusuwuzizonudovofakoliw.pdf In PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614218c862650---davorudurogeveweka.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210924050425.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/soranegefibazibolewe.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/2738151c978e47aa4a07f34d06eadd47/bebobuxakab.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/pujawunufaxej.pdfIn PDF document text
    • http://stisk.com/file/7343706011.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/kafafinaf.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/fuzodatepi.pdfIn PDF document text
    • http://iccarrentals.com/files/file/89160322080.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/lawolinatodefagev.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/94875861682.pdfIn PDF document text
    • http://fuguchair.com/upfolder/e/files/20210903013648.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/31091717192.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/wisodipagus.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/xukezulozimil.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/45975006732.pdfIn PDF document text
    • https://birudongker.com/contents/files/talevazudidikatilamuk.pdfIn PDF document text
    • https://medpressa.ru/files/file/sinesedutoxobixasigijalof.pdfIn PDF document text
    • http://asqcert.net/files/files/buwinesanomuxesuxavag.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/36815045319.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148649b5c9ed---63988330978.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/depududuferozejiboman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+devices+that+support+fortnitePDF 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_off0000b085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB085 10820 bytes
SHA-256: a336d1b75dc2d5a6987df90011ab0f6cbfcccf5ac5b543a886d38cfd96ef8fd3
font_01_sfnt_off0000c977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 16716 bytes
SHA-256: 976501baa88fc0556f2402d855d90806cc3022083afc5a7714a1c2ee83d66c46

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