Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e073bbe8544504…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 19:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9cc1ef7c910b829865d4b9806c63e19a SHA-1: 86389a6eb252f2b43b9c8476d7acb327a51e1743 SHA-256: 14e073bbe85445044b5b7e5a1b0c04e1e41379de8a6d4a14c1ecfa8589e7ba5b
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to distribute malware or phish for information. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://synerhu.ru/uplcv?utm_term=angry+birds+classic+mod+apk+unlimited+gems+and+coins PDF link annotation
    • http://busankid.com/webfiles/board/file///nuruforelovadezupezedavu.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/pojefabosut.pdfIn PDF document text
    • http://kco.su/userfiles/file/bofigizegejanasafomizug.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/84124838316.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/38847932152.pdfIn PDF document text
    • http://okun.su/upload/file/252129471.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/diwinapoberagizamajuza.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/dccc00f86kjo6ns4h4pcble5fcpjc85g/40056326553.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4a81c36f---71781460249.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161385f853c321---xafilukagegitokemuvi.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14a70ed5f---wafisubege.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd127090f---30956721841.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/runaxovuwedidolarib.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/bf4d18174f603f9573dd29500c47cafa/37314205699.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/fudozi.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/82201836179.pdfIn PDF document text
    • https://kawanmto.net/contents/files/ruwovawosol.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/81758652162.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/53101289327.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/97042097835.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/tavegerapuw.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/79108361315.pdfIn PDF document text
    • http://holzweiss.at/31583487107.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/5161546199.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/xaputogonusuri.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613386117e207---7641986155.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74E 17388 bytes
SHA-256: 66b05dfba73cc32ff32077368cc51a120e88112f8f8cc86784c7aa064adc4265
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 11284 bytes
SHA-256: beed2a81003fb6d5c0d74915eec20e43ffadc9e66d4b1b567b3dd7758e19f9e3

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