Malicious PDF — malware analysis report

Static analysis result for SHA-256 a051ba5839c4f894…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 22:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23e6cabd6050e79ec781413502288e58 SHA-1: 9cd49d7e832d361aba71d43f4548d3ab45ec4935 SHA-256: a051ba5839c4f89436dcd81d163341103e38de3f71b440e0ca29aff03586da96
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://camelliafb.com/uploads/files/202109041021448489.pdf In PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/zavabod.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/7943743834.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/78517289741.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/92113508099.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/bezogixu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/didomufer.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/45704149040.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/xibazibizazerorusufer.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/52433174468.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0d0cc9c6---26482320664.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/8256213706.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/9509138409.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/0d7add33fcbc3944f02881c4990b403b/puxipitolirizuxanebidek.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/mudimubolowotikap.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/5610871935.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/58477859761.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/sevukazowaketomaki.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/ladebuzepepepusufejuregi.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/22144097892.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/waxon.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614659a5da19a---zujes.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210919_DB3901ADE526FDCF.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/58004371246.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/82484158411.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sarumemixididevasebidupum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=i+found+out+synonymPDF 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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 10148 bytes
SHA-256: fa7c581711354602e0414ad50d1a7f829efe4fe3395a9f7ae361e23e7b1ada0a
font_01_sfnt_off0000c957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC957 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 17588 bytes
SHA-256: 24ae1939608d468859af79c163d53147269bd83b90237eb078d73dcbbddcd8b1