Malicious PDF — malware analysis report

Static analysis result for SHA-256 527609ac5622552d…

MALICIOUS

PDF

84.6 KB Created: 2021-09-17 10:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a1e883f8ffe0fcbf5755e104899e238c SHA-1: 7ccbd15ad46783d2c528685a515e7d71436bd9bd SHA-256: 527609ac5622552d04f64d77e7f38491effe2a4c3a404809bb84ee34006b7753
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, but the presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of using compromised or low-reputation sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://deltagroup.bg/uploads/file/godesufuxokesonifaperar.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rb4odili0grrtc6457p81cm3bi/96687204699.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141289345097---rijebadokuxuzakikivis.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/sutudiwor.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/39144006622.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/kadipawopizukapapekepeni.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/2027301457.pdfIn PDF document text
    • http://methese.com/upload/files/subekegewidufepo.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/4869003259.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/biboposol.pdfIn PDF document text
    • https://adium.ru/userfiles/file/kaxevakumefe.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/81108805219.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/62225200538.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/jixesimem.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///disoj.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/fuwosiwudasaforunuzeroj.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338fbd39c36---bepilo.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161443d94ed05c---29711386458.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210910172212.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/zijeruzonetameti.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210908182022.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161406d4729736---roguwo.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/tazugirisijovom.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/28055991343.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nogudalujefom.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f692c67c4b---63755051056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=block+site+apkPDF 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_off0000dee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 20916 bytes
SHA-256: 73e86732684bb4ff86b3dc90f532a4748792bd52396ab33f7f64d36db7c5a7f4
font_02_sfnt_off00012d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D64 10308 bytes
SHA-256: a0c48876c9d524733193803b917fe1e29d1557d324dbfabc00b68d07eda283e0

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