Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79bec54e4eca4e9…

MALICIOUS

PDF

75.4 KB Created: 2021-09-20 06:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7480285613d284d3ad3077396d22747 SHA-1: f683e05a42ec4913bfa823a5790417685b3be43f SHA-256: a79bec54e4eca4e9eba52b0e78c9ae4eadc0dc7f9b30c73aeb251965a899a525
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains that appear to be used for hosting or redirecting to other PDF files. Heuristics indicate this is a link farm, likely for SEO manipulation or to lure users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, possibly related to phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://skvacations.com/userfiles/file/mupoka.pdf In PDF document text
    • https://worldtradezone.com/userfiles/file/fumikefodazonu.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/89372137053.pdfIn PDF document text
    • http://enricobarraco.com/files/6868028906.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/vumuvixetuluguf.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/59284587322.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/poguxe.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/jedepijawokowumusowov.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/binixo.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f419a3ca4b---lafazisalopoz.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5a9f1be7---zelutuforava.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143208c752e9---49051140062.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8f8f94237---sexidejoferilave.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b515aecff---13222092542.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614249f969376---luxotojokar.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/37165563226.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090201484273499.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7197fd06---91690384145.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/godilulupaforif.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/32145978177.pdfIn PDF document text
    • https://kaisar168.com/contents/files/jusodajuwajipukizid.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/remonowutuziwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=png+to+vector+drawable+onlinePDF 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_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 10668 bytes
SHA-256: 248049de69c3d2d4fc7eaa28c3cbc26f6ee906d6d50985dce728db15e7600671
font_01_sfnt_off0000d9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EC 17800 bytes
SHA-256: 2c42a058010e9f532ee7714bd6bd74a9500557ac8c6722f67db80e2e15f44fa5
font_02_sfnt_off00010878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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