Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4257dc9d45474c3…

MALICIOUS

PDF

241.1 KB Created: 2021-07-05 08:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 473cd6a4a27eeef892039d6fed421e0b SHA-1: b5eb96b1bfbe534ee3d46bdcffdb031341f80d55 SHA-256: b4257dc9d45474c39c91b00f3df6a923b95be303a5451ca9fccb3ab0ede374e5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing attack, leveraging an image lure to redirect users to a compromised WordPress site. The high-confidence heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' and the presence of numerous URLs pointing to potentially compromised CMS upload directories strongly indicate a malicious intent to deliver a secondary payload. The ClamAV detection further supports its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8156

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=stand+up+stood+up PDF link annotation
    • http://candybeauty.vn/upload/files/rudovabuwewajomamimev.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa96a24179---kuzifanonokudazobomuredo.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/23180332751.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/mugotokewasimibevuwupena.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/wufibufigemu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738da718d36---diwolokidikesewaje.pdfIn PDF document text
    • http://prosquash.by/data/rupijaxepujamavokuduwowe.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/6e33ac1be2575539d1f6730b2b77e980/69004579466.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/04436cd36cf8375269c988f6b7d0519b/zuzofidazasipajalolexux.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/77617969097.pdfIn PDF document text
    • http://brukbet.com/user_images/file/73548063083.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/magibeletunavejulawami.pdfIn PDF document text
    • http://orderkai.com/uploads/files/74389536573.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a0c1d4a78---88209536054.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e1112fe73---mogedefetumipamubaliw.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915af27af8b---semuri.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607072ad5f6a2---veraxeraji.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/94939388016.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa86b43d63---rorapimobudirimip.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/81945057265.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/eb1b42ad033578518f9a5e948e3cfc1d/77136986332.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70fe088fae---30315865257.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/55d5c0a41b6e741c37c028be3f7d50f4/97350166691.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/oh7oppe71vl0kk5papeoohj162/20847266081.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160700908e249b---numiwubagopipumo.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/43794429642.pdfIn PDF document text
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00036ebd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36EBD 37652 bytes
SHA-256: 7ebf7b6665b6203ed3c1f63e0f5ba6f1a4ec75101c73a0a5b6ccc77fc730354b
font_00_sfnt_off00026bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26BEE 10188 bytes
SHA-256: becc785c36443d9b90f2aeda3c9f6ea0e08ed43cf79ad478abd5a0db9386d5f2
font_01_sfnt_off000282d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x282D6 44448 bytes
SHA-256: f64f35a7945f9fd06095dfcb2b392b3f70abced02328f219018481ea2a7a785a
font_02_sfnt_off0002fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FB7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00031391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31391 44520 bytes
SHA-256: 8a4f6e3072d9ba54a6d2d17dfd3070decd8a74c3645972f93a825f8ca4768266

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