Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee6da37ea672a92…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 07:11:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b13c67438440450627c2a57431a4cf5 SHA-1: f37238d67aabb033cd6150e45f39c40538226a0b SHA-256: 2ee6da37ea672a9214beb31bff0ace2a3a1e9fcbfc76e01c6be7f0a52d619e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the heuristic findings.

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 https://pavillonwohlen.ch/userfiles/files/92962385714.pdf In PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2fb01a73d---3599379355.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d4336e057ed4064b48add2da556e5852/98737709459.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/35526223367.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/37291859801c43859d48cf5635294c0a/49504747930.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/gefiduwuluxi.pdfIn PDF document text
    • http://sentai.cc/data/file/20210901_100309_980.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/balimokisaxaboluzel.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/59575cb40a1508a455e84c476e54d57b/72320386584.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/novigosuzeboj.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/wufexitizexuzumo.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210907073333.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/ropizubujuvijikanatesalu.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d24ec80a9d10bf4a60a14354ac59fccd/mojutudulusunesilejemugu.pdfIn PDF document text
    • http://sdes.in/uploads/18065871154.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/55377040955.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/nujakepatevedakuf.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/9456346288.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613518afeca87---rapatopaxoxuborubekexojog.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/65103877913.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/kuxikuvigodanarimazomom.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/woxeritamomogibe.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/jokawowabemoxofimiwutim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=kingsoft+office+apk+free+downloadPDF 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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 16920 bytes
SHA-256: 727e990701cf560cfc20b2f0e4c513ae2146a1506e14438a451585cdbae93bdf
font_01_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 10964 bytes
SHA-256: 9d2828eaf3fe0963373c4c28ee3293a70e722feddefce620809335900a3b4f8a
font_02_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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