Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d026a858ae2000e…

MALICIOUS

PDF

84.8 KB Created: 2021-09-10 20:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a2833b961508992c82cc90c58a26c67c SHA-1: ad0dbb52093ecdbac0a6bb8336c2418ab5e8c9f7 SHA-256: 1d026a858ae2000e8de65f6825481da31e4fb876d8dd0c28c04fc6f9dca01766
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mai-colle.jp/userfiles/file/mofodedigepagugewovifeto.pdf In PDF document text
    • https://pnvvr.ro/userfiles/file/19389671284.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/41722790396.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hh88qpia0ui2192h8vk3akk5k1/waviwonaripajotituselob.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/tewemenepudebagebob.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a9d815fe---tewajujul.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/96424455536.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/3015460438.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/pixizuje.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/xurakidubebitijopiwunugot.pdfIn PDF document text
    • http://gotween.com/userfiles/file///28792100357.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5c985b66---galek.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/savojapodoranaradafatifeg.pdfIn PDF document text
    • http://status.cz/UserFiles/File/folawodamoforu.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/jadasavat.pdfIn PDF document text
    • http://balalajka.nu/media/16958000302.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/kuwejerofigafuwodewuvu.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/7714476796.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/nijibopela.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/xetutiv.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/suzam.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/vunepopax.pdfIn PDF document text
    • http://moneymaker-gold.de/files/xuzuvalabimunatefuvisudin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=serial+photoshop+cc+2015PDF 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_off0000e511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD28 10872 bytes
SHA-256: b2bb84726410ae794623dad5fdac806855845cb6f5866ee28443a37c8f11bc12
font_02_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 17996 bytes
SHA-256: 629a676e4eb8ccba509ff68779034d9b91dc069a0e260255e49a12b1c4b0bf54