Malicious PDF — malware analysis report

Static analysis result for SHA-256 a518e0dad7ec0834…

MALICIOUS

PDF

97.7 KB Created: 2021-07-18 08:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1c6dd72fef3ade110a368c62486bee68 SHA-1: 97c1fcc8082411927485a6a5c34654fbe1cec094 SHA-256: a518e0dad7ec08341588ae7fe780a8b667e015a0e637da4570dee668344ff3f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a phishing or redirection campaign designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1855204b81---vekonijajawoxatovuzivof.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/72095deb68f5228455d09512a2152d77/95024322443.pdfIn PDF document text
    • https://securitydm.com/slicice/file/8419178846.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/41616957.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/e3r1rpre0u92k8tgtjvc687vi7/legenamerasagot.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/30931921995.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2163273bb356231f687633758dac72ec/negojaduganumoniposokowe.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/64706043774.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/24275056101.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754e2b708fb---sopovovekep.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/53497826886.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/e1bruhvhv9am8ibqittc84ifp5/tagibevaxebizu.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kqv0kq6j7c5k7in7h4rutv33k4/83424601340.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f7f002411---kivazifefomiwuza.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/m1poce4k7upv7fftr2rhafvqul/kokufojan.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/36023678822.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b0fc927c9---35960163125.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6e887f37c6273884900ea50436c8d1c5/66919589729.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/zisanesomuzaja.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/9170302656.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/lfkcbm72gef5des4tju6srb9bi/75667384686.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/pujaruwud.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/babononilidi.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/sixobugusowikegijibiteva.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/bigokovezozipovo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vokasorexasebarabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+do+domestic+frogs+eatPDF 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_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 10768 bytes
SHA-256: 416d4a03fd814d38fedf7554a832b6001cacbf3150ee836cb643c3fbec041a83
font_02_sfnt_off00014cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF4 17344 bytes
SHA-256: 4c5f49be688be483ac53955ec19dc33d2eef0ef2d01dc2347f21d6ecaf06aa5b