Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b90f3488a92597…

MALICIOUS

PDF

125.6 KB Created: 2021-07-01 21:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 88e95bee4b694838b85c0a8b9c85d62f SHA-1: 2ccf870d6747ef2e1ad47006eb54e8b46a64cd3e SHA-256: 83b90f3488a92597d03348c145dc055c7f49c59110d2461c91639e133087f629
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9869

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.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d01b5b0a4ad---39985297589.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca27291036---dibazugaxoxukovefudo.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/dexubalazilus.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/tojomugedoxejewosi.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/gesepazalinige.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/867c821498ee3b48e7cc14cbcb307ed0/73982654490.pdfIn PDF document text
    • https://superpart.com/files/84008593566.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac76a27c9---boxigozan.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/wimewoza.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/kederut.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/kexuferalabetamobebebug.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/314671dc9b362e11b2682bbe3cc4d873/zidakibalexagogupopeweta.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea641ced0---wepuzurawanorifot.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a8b7c0f12fda73b3e06445ca57a1df2c/33861402068.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/88711562701.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jalapaxivereri.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ecee733b7---kafajur.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609422aee1cd1---17456487670.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/96514412419.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/21111345371.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085326b4b315---vaxefa.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec12a89fb8---zuviwuwikigov.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/gnb7qeg25e37pi79g2umi3moi5/29226360483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=starting+a+sentence+with+in+additionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000172ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ABD 18176 bytes
SHA-256: 96d5d272eec4dfd1bfaeb8517ba00c175e3f6ab4f5746a1be443de4fc52019a2
font_02_sfnt_off0001baae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAAE 10764 bytes
SHA-256: b3545a8e3da94ea6e63532341a7c5b0365a1b936bf94261fe463307c5c91f85e
font_03_sfnt_off0001d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D337 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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