Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd42200368ecf666…

MALICIOUS

PDF

141.9 KB Created: 2021-08-29 09:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e136efee4500b08a85e9d7dcbb7c4dab SHA-1: 7e34f854613107ca03bcb4ec7375e60fbd800b26 SHA-256: cd42200368ecf666f66919116abb4eb84f07f05576c6b0d51d4a68a219107db5
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed as a callback phishing or tech-support scam. While no scripts were directly extracted, the presence of embedded URLs and the ML classification strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0e5b080837e4df618bc34a0473a5af73/berovemopugike.pdf In PDF document text
    • http://jjinline.org/file_upload/file/bisufifesatol.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/worejubedu.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/16953378759.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4389ce22a6e695d6be9adb7eea96353d/95007952605.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/gikubujafegoxi.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8db2e2506---peturi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/2po0udmp77g8d6315m4gpg5koi/remowazoxunivoveroz.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/f66d594d4d84bd9ecf148db74d3acaec/mubakegeferozidedopuwom.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/4777d0bbdf63235439d4d707844573f6/xaturebejegajuv.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/xijilemavozegabebum.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/28558800753.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/87731299659.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/37256299390.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/bixexulakikojekabakitirak.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb80dcc9e0---raxizetewuwufewopagamud.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f895823fd0446997271d3928be2abe2e/tufinisedimezutifubinas.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ded7c897010---70420412792.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/bomuneritodaravew.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rsideum0lg5ukijgtcjbjdvfpl/18875628217.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/f2d2e58f479781088a32811255cb305a/30553452771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=great+commission+baptistsPDF 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_off0001c123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C123 21508 bytes
SHA-256: 6ce8f40fecf297705c006f7e0e2c5442b69ccf7cb4af3168c321a44e4214cc6e
font_01_sfnt_off0001f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21169 10668 bytes
SHA-256: 7dc8be283dd031e218abd86c24682f766f9df9c4761402b173b3b5da9867b2db