Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82bba941ea4c22b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 06:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2e3df019f1842f502a583aef8fbe41b SHA-1: 828315fda29073dc44e230ac52c23c77630d4d5b SHA-256: e82bba941ea4c22b1ceb6e4ef4fa96ff5a410718dae2f5f28db6bcc50210a9d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The presence of a download button lure suggests an attempt to trick users into downloading further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/b31a6a32a74bbee3cbd30ad4c484b1ff/26492180672.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/lcka13mrt6scsal7ctlisb13mq/suruvaxipujazomexukejapu.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/xobuxapogoxoli.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/fg0iuugngi1bi8j7cihuve7se2/zegebamiguteri.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/mesadala.pdfIn PDF document text
    • https://shibbirs.com/media/files/77146205311.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/21201290344.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fd26e1c6140---moximomowelafizuzaridobeg.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/5971dedf76a5d57d04d54d679d72cd91/97427797061.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/momibofalufo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607998a8d8081---tipiweg.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/dilusituwajusulikitizufub.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/rumusizaxugozufuxif.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4a9e1a41eeaca3b44f4e4c03d8fcc6f8/xajugupigabaforodaxin.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e88785f510c86a339be1f705f7a6f300/zidawur.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/533c7e4141fc7ba6a21b9bd8910f5c0b/70744057098.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/99609837712.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/79206486673.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/bol0otodc888hem3h26eh7lbhj/pururome.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/15072837814.pdfIn PDF document text
    • https://atl-50.com/files/file/93522868914.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f1bec69731df29640217b6f3a6a0cb71/59646436080.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/14377701501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=correlative+conjunction+worksheets+5th+gradePDF 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_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 11288 bytes
SHA-256: 39655a98fdc594761d933d3467c7d40fd6efe6e25ac15900a253b89b8d87bc15
font_01_sfnt_off0000ee1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 18120 bytes
SHA-256: 738ca6472690a26336caf47781e6682a369ec179ef9dee8580b5f078d90b6a96

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