Malicious PDF — malware analysis report

Static analysis result for SHA-256 591cd96230974e13…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 16:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1a0a14696afb5c38759100c42a73993 SHA-1: 57a0b1f562f8d8b7397cde0391473aec7cb1eff4 SHA-256: 591cd96230974e1305e3592a226873ba53e0e52e9ea7ce194dbdf1235550991d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of multiple link farm heuristics and embedded URLs pointing to various PDF files suggests an attempt to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/28762383634.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af48fab94a---9222832567.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/37576303774.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/76432321396.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/ronorisigo.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/13607812834.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/zokovilotatugagefularon.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7262da1d---bibukupubiwivebufe.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/62890310300.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f786dabc0c---pupisutigemumop.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/laduzoxinufoparor.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///wuxibekibemudu.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/30983787981.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/53506421536.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613788ba10a19---watagagurul.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/xijudasigi.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/17243361858.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/ruguzugawutesosilax.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/23212633653.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/surazonok.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/buzenumixi.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vokululujukezusiwomaw.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/ditebaligazevotefum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=unlock+pin+androidPDF 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_off0000d6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FE 17732 bytes
SHA-256: 7d011cc1b460ce409a18a8318cd08541ad434e33555f752a49a405e43f7ecb0d
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 10208 bytes
SHA-256: 8ccb254a821d73cfeffc88f85d0775c4a91a4ec2d187af83d1c14491e951f50c

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